diff --git a/SETTINGS.rst b/SETTINGS.rst
index 64163c001..dc42430f0 100644
--- a/SETTINGS.rst
+++ b/SETTINGS.rst
@@ -143,3 +143,7 @@ not affect the client.
 operator is in one of these groups, the client disconnected and reconnects again.
 All requests urls (including websockets) are now prefixed with `/prioritize`, so
 these requests from "prioritized clients" can be routed to different servers.
+
+`AUTOUPDATE_DELAY`: The delay to send autoupdates. This feature can be
+deactivated by setting it to `None`. It is deactivated per default. The Delay is
+given in seconds
diff --git a/client/src/app/core/core-services/autoupdate.service.ts b/client/src/app/core/core-services/autoupdate.service.ts
index ceaeda77a..a286bc3e9 100644
--- a/client/src/app/core/core-services/autoupdate.service.ts
+++ b/client/src/app/core/core-services/autoupdate.service.ts
@@ -3,9 +3,10 @@ import { Injectable } from '@angular/core';
 import { BaseModel } from '../../shared/models/base/base-model';
 import { CollectionStringMapperService } from './collection-string-mapper.service';
 import { DataStoreService, DataStoreUpdateManagerService } from './data-store.service';
+import { Mutex } from '../promises/mutex';
 import { WebsocketService, WEBSOCKET_ERROR_CODES } from './websocket.service';
 
-interface AutoupdateFormat {
+export interface AutoupdateFormat {
     /**
      * All changed (and created) items as their full/restricted data grouped by their collection.
      */
@@ -36,6 +37,19 @@ interface AutoupdateFormat {
     all_data: boolean;
 }
 
+export function isAutoupdateFormat(obj: any): obj is AutoupdateFormat {
+    const format = obj as AutoupdateFormat;
+    return (
+        obj &&
+        typeof obj === 'object' &&
+        format.changed !== undefined &&
+        format.deleted !== undefined &&
+        format.from_change_id !== undefined &&
+        format.to_change_id !== undefined &&
+        format.all_data !== undefined
+    );
+}
+
 /**
  * Handles the initial update and automatic updates using the {@link WebsocketService}
  * Incoming objects, usually BaseModels, will be saved in the dataStore (`this.DS`)
@@ -45,6 +59,8 @@ interface AutoupdateFormat {
     providedIn: 'root'
 })
 export class AutoupdateService {
+    private mutex = new Mutex();
+
     /**
      * Constructor to create the AutoupdateService. Calls the constructor of the parent class.
      * @param websocketService
@@ -79,15 +95,17 @@ export class AutoupdateService {
      * Handles the change ids of all autoupdates.
      */
     private async storeResponse(autoupdate: AutoupdateFormat): Promise<void> {
+        const unlock = await this.mutex.lock();
         if (autoupdate.all_data) {
             await this.storeAllData(autoupdate);
         } else {
             await this.storePartialAutoupdate(autoupdate);
         }
+        unlock();
     }
 
     /**
-     * Stores all data from the autoupdate. This means, that the DS is resettet and filled with just the
+     * Stores all data from the autoupdate. This means, that the DS is resetted and filled with just the
      * given data from the autoupdate.
      * @param autoupdate The autoupdate
      */
@@ -116,27 +134,41 @@ export class AutoupdateService {
 
         // Normal autoupdate
         if (autoupdate.from_change_id <= maxChangeId + 1 && autoupdate.to_change_id > maxChangeId) {
-            const updateSlot = await this.DSUpdateManager.getNewUpdateSlot(this.DS);
-
-            // Delete the removed objects from the DataStore
-            for (const collection of Object.keys(autoupdate.deleted)) {
-                await this.DS.remove(collection, autoupdate.deleted[collection]);
-            }
-
-            // Add the objects to the DataStore.
-            for (const collection of Object.keys(autoupdate.changed)) {
-                await this.DS.add(this.mapObjectsToBaseModels(collection, autoupdate.changed[collection]));
-            }
-
-            await this.DS.flushToStorage(autoupdate.to_change_id);
-
-            this.DSUpdateManager.commit(updateSlot, autoupdate.to_change_id);
+            await this.injectAutupdateIntoDS(autoupdate, true);
         } else {
             // autoupdate fully in the future. we are missing something!
+            console.log('Autoupdate in the future', maxChangeId, autoupdate.from_change_id, autoupdate.to_change_id);
             this.requestChanges();
         }
     }
 
+    public async injectAutoupdateIgnoreChangeId(autoupdate: AutoupdateFormat): Promise<void> {
+        const unlock = await this.mutex.lock();
+        console.debug('inject autoupdate', autoupdate);
+        await this.injectAutupdateIntoDS(autoupdate, false);
+        unlock();
+    }
+
+    private async injectAutupdateIntoDS(autoupdate: AutoupdateFormat, flush: boolean): Promise<void> {
+        const updateSlot = await this.DSUpdateManager.getNewUpdateSlot(this.DS);
+
+        // Delete the removed objects from the DataStore
+        for (const collection of Object.keys(autoupdate.deleted)) {
+            await this.DS.remove(collection, autoupdate.deleted[collection]);
+        }
+
+        // Add the objects to the DataStore.
+        for (const collection of Object.keys(autoupdate.changed)) {
+            await this.DS.add(this.mapObjectsToBaseModels(collection, autoupdate.changed[collection]));
+        }
+
+        if (flush) {
+            await this.DS.flushToStorage(autoupdate.to_change_id);
+        }
+
+        this.DSUpdateManager.commit(updateSlot, autoupdate.to_change_id);
+    }
+
     /**
      * Creates baseModels for each plain object. If the collection is not registered,
      * A console error will be issued and an empty list returned.
@@ -160,9 +192,8 @@ export class AutoupdateService {
      * The server should return an autoupdate with all new data.
      */
     public requestChanges(): void {
-        const changeId = this.DS.maxChangeId === 0 ? 0 : this.DS.maxChangeId + 1;
-        console.log(`requesting changed objects with DS max change id ${changeId}`);
-        this.websocketService.send('getElements', { change_id: changeId });
+        console.log(`requesting changed objects with DS max change id ${this.DS.maxChangeId}`);
+        this.websocketService.send('getElements', { change_id: this.DS.maxChangeId });
     }
 
     /**
diff --git a/client/src/app/core/core-services/data-store.service.ts b/client/src/app/core/core-services/data-store.service.ts
index a9ff9fc7e..2fa19e4c7 100644
--- a/client/src/app/core/core-services/data-store.service.ts
+++ b/client/src/app/core/core-services/data-store.service.ts
@@ -258,6 +258,7 @@ export class DataStoreUpdateManagerService {
 
     private serveNextSlot(): void {
         if (this.updateSlotRequests.length > 0) {
+            console.log('Concurrent update slots');
             const request = this.updateSlotRequests.pop();
             request.resolve();
         }
@@ -665,4 +666,11 @@ export class DataStoreService {
         await this.storageService.set(DataStoreService.cachePrefix + 'DS', this.jsonStore);
         await this.storageService.set(DataStoreService.cachePrefix + 'maxChangeId', changeId);
     }
+
+    public print(): void {
+        console.log('Max change id', this.maxChangeId);
+        console.log('json storage');
+        console.log(JSON.stringify(this.jsonStore));
+        console.log(this.modelStore);
+    }
 }
diff --git a/client/src/app/core/core-services/http.service.ts b/client/src/app/core/core-services/http.service.ts
index 7dfffc0ae..fbf1f01fc 100644
--- a/client/src/app/core/core-services/http.service.ts
+++ b/client/src/app/core/core-services/http.service.ts
@@ -3,6 +3,7 @@ import { Injectable } from '@angular/core';
 
 import { TranslateService } from '@ngx-translate/core';
 
+import { AutoupdateFormat, AutoupdateService, isAutoupdateFormat } from './autoupdate.service';
 import { OpenSlidesStatusService } from './openslides-status.service';
 import { formatQueryParams, QueryParams } from '../definitions/query-params';
 
@@ -17,12 +18,12 @@ export enum HTTPMethod {
     DELETE = 'delete'
 }
 
-export interface DetailResponse {
+export interface ErrorDetailResponse {
     detail: string | string[];
     args?: string[];
 }
 
-function isDetailResponse(obj: any): obj is DetailResponse {
+function isErrorDetailResponse(obj: any): obj is ErrorDetailResponse {
     return (
         obj &&
         typeof obj === 'object' &&
@@ -31,6 +32,15 @@ function isDetailResponse(obj: any): obj is DetailResponse {
     );
 }
 
+interface AutoupdateResponse {
+    autoupdate: AutoupdateFormat;
+    data?: any;
+}
+
+function isAutoupdateReponse(obj: any): obj is AutoupdateResponse {
+    return obj && typeof obj === 'object' && isAutoupdateFormat((obj as AutoupdateResponse).autoupdate);
+}
+
 /**
  * Service for managing HTTP requests. Allows to send data for every method. Also (TODO) will do generic error handling.
  */
@@ -55,7 +65,8 @@ export class HttpService {
     public constructor(
         private http: HttpClient,
         private translate: TranslateService,
-        private OSStatus: OpenSlidesStatusService
+        private OSStatus: OpenSlidesStatusService,
+        private autoupdateService: AutoupdateService
     ) {
         this.defaultHeaders = new HttpHeaders().set('Content-Type', 'application/json');
     }
@@ -82,7 +93,7 @@ export class HttpService {
     ): Promise<T> {
         // end early, if we are in history mode
         if (this.OSStatus.isInHistoryMode && method !== HTTPMethod.GET) {
-            throw this.handleError('You cannot make changes while in history mode');
+            throw this.processError('You cannot make changes while in history mode');
         }
 
         // there is a current bug with the responseType.
@@ -108,9 +119,10 @@ export class HttpService {
         };
 
         try {
-            return await this.http.request<T>(method, url, options).toPromise();
-        } catch (e) {
-            throw this.handleError(e);
+            const responseData: T = await this.http.request<T>(method, url, options).toPromise();
+            return this.processResponse(responseData);
+        } catch (error) {
+            throw this.processError(error);
         }
     }
 
@@ -120,7 +132,7 @@ export class HttpService {
      * @param e The error thrown.
      * @returns The prepared and translated message for the user
      */
-    private handleError(e: any): string {
+    private processError(e: any): string {
         let error = this.translate.instant('Error') + ': ';
         // If the error is a string already, return it.
         if (typeof e === 'string') {
@@ -142,12 +154,14 @@ export class HttpService {
         } else if (!e.error) {
             error += this.translate.instant("The server didn't respond.");
         } else if (typeof e.error === 'object') {
-            if (isDetailResponse(e.error)) {
-                error += this.processDetailResponse(e.error);
+            if (isErrorDetailResponse(e.error)) {
+                error += this.processErrorDetailResponse(e.error);
             } else {
                 const errorList = Object.keys(e.error).map(key => {
                     const capitalizedKey = key.charAt(0).toUpperCase() + key.slice(1);
-                    return `${this.translate.instant(capitalizedKey)}: ${this.processDetailResponse(e.error[key])}`;
+                    return `${this.translate.instant(capitalizedKey)}: ${this.processErrorDetailResponse(
+                        e.error[key]
+                    )}`;
                 });
                 error = errorList.join(', ');
             }
@@ -168,11 +182,9 @@ export class HttpService {
      * @param str a string or a string array to join together.
      * @returns Error text(s) as single string
      */
-    private processDetailResponse(response: DetailResponse): string {
+    private processErrorDetailResponse(response: ErrorDetailResponse): string {
         let message: string;
-        if (response instanceof Array) {
-            message = response.join(' ');
-        } else if (response.detail instanceof Array) {
+        if (response.detail instanceof Array) {
             message = response.detail.join(' ');
         } else {
             message = response.detail;
@@ -187,6 +199,14 @@ export class HttpService {
         return message;
     }
 
+    private processResponse<T>(responseData: T): T {
+        if (isAutoupdateReponse(responseData)) {
+            this.autoupdateService.injectAutoupdateIgnoreChangeId(responseData.autoupdate);
+            responseData = responseData.data;
+        }
+        return responseData;
+    }
+
     /**
      * Executes a get on a path with a certain object
      * @param path The path to send the request to.
diff --git a/client/src/app/core/core-services/openslides.service.ts b/client/src/app/core/core-services/openslides.service.ts
index 07d27a469..a35c47ed8 100644
--- a/client/src/app/core/core-services/openslides.service.ts
+++ b/client/src/app/core/core-services/openslides.service.ts
@@ -130,10 +130,7 @@ export class OpenSlidesService {
      * Init DS from cache and after this start the websocket service.
      */
     private async setupDataStoreAndWebSocket(): Promise<void> {
-        let changeId = await this.DS.initFromStorage();
-        if (changeId > 0) {
-            changeId += 1;
-        }
+        const changeId = await this.DS.initFromStorage();
         // disconnect the WS connection, if there was one. This is needed
         // to update the connection parameters, namely the cookies. If the user
         // is changed, the WS needs to reconnect, so the new connection holds the new
@@ -141,7 +138,7 @@ export class OpenSlidesService {
         if (this.websocketService.isConnected) {
             await this.websocketService.close(); // Wait for the disconnect.
         }
-        await this.websocketService.connect({ changeId: changeId }); // Request changes after changeId.
+        await this.websocketService.connect(changeId); // Request changes after changeId.
     }
 
     /**
diff --git a/client/src/app/core/core-services/prioritize.service.ts b/client/src/app/core/core-services/prioritize.service.ts
index a4bcf744d..e7677ab3b 100644
--- a/client/src/app/core/core-services/prioritize.service.ts
+++ b/client/src/app/core/core-services/prioritize.service.ts
@@ -40,7 +40,7 @@ export class PrioritizeService {
         if (this.openSlidesStatusService.isPrioritizedClient !== opPrioritized) {
             console.log('Alter prioritization:', opPrioritized);
             this.openSlidesStatusService.isPrioritizedClient = opPrioritized;
-            this.websocketService.reconnect({ changeId: this.DS.maxChangeId });
+            this.websocketService.reconnect(this.DS.maxChangeId);
         }
     }
 }
diff --git a/client/src/app/core/core-services/websocket.service.ts b/client/src/app/core/core-services/websocket.service.ts
index 17b4ad62e..b7208416c 100644
--- a/client/src/app/core/core-services/websocket.service.ts
+++ b/client/src/app/core/core-services/websocket.service.ts
@@ -55,14 +55,6 @@ export const WEBSOCKET_ERROR_CODES = {
     WRONG_FORMAT: 102
 };
 
-/*
- * Options for (re-)connecting.
- */
-interface ConnectOptions {
-    changeId?: number;
-    enableAutoupdates?: boolean;
-}
-
 /**
  * Service that handles WebSocket connections. Other services can register themselfs
  * with {@method getOberservable} for a specific type of messages. The content will be published.
@@ -207,7 +199,7 @@ export class WebsocketService {
      *
      * Uses NgZone to let all callbacks run in the angular context.
      */
-    public async connect(options: ConnectOptions = {}, retry: boolean = false): Promise<void> {
+    public async connect(changeId: number | null = null, retry: boolean = false): Promise<void> {
         const websocketId = Math.random().toString(36).substring(7);
         this.websocketId = websocketId;
 
@@ -220,17 +212,10 @@ export class WebsocketService {
             this.shouldBeClosed = false;
         }
 
-        // set defaults
-        options = Object.assign(options, {
-            enableAutoupdates: true
-        });
+        const queryParams: QueryParams = {};
 
-        const queryParams: QueryParams = {
-            autoupdate: options.enableAutoupdates
-        };
-
-        if (options.changeId !== undefined) {
-            queryParams.change_id = options.changeId;
+        if (changeId !== null) {
+            queryParams.change_id = changeId;
         }
 
         // Create the websocket
@@ -398,7 +383,7 @@ export class WebsocketService {
             const timeout = Math.floor(Math.random() * 3000 + 2000);
             this.retryTimeout = setTimeout(() => {
                 this.retryTimeout = null;
-                this.connect({ enableAutoupdates: true }, true);
+                this.connect(null, true);
             }, timeout);
         }
     }
@@ -438,9 +423,9 @@ export class WebsocketService {
      *
      * @param options The options for the new connection
      */
-    public async reconnect(options: ConnectOptions = {}): Promise<void> {
+    public async reconnect(changeId: number | null = null): Promise<void> {
         await this.close();
-        await this.connect(options);
+        await this.connect(changeId);
     }
 
     /**
diff --git a/client/src/app/core/promises/mutex.ts b/client/src/app/core/promises/mutex.ts
new file mode 100644
index 000000000..3de879915
--- /dev/null
+++ b/client/src/app/core/promises/mutex.ts
@@ -0,0 +1,30 @@
+/**
+ * A mutex as described in every textbook
+ *
+ * Usage:
+ * ```
+ * mutex = new Mutex(); // create e.g. as class member
+ *
+ * // Somewhere in the code to lock (must be async code!)
+ * const unlock = await this.mutex.lock()
+ * // ...the code to synchronize
+ * unlock()
+ * ```
+ */
+export class Mutex {
+    private mutex = Promise.resolve();
+
+    public lock(): PromiseLike<() => void> {
+        // this will capture the code-to-synchronize
+        let begin: (unlock: () => void) => void = () => {};
+
+        // All "requests" to execute code are chained in a promise-chain
+        this.mutex = this.mutex.then(() => {
+            return new Promise(begin);
+        });
+
+        return new Promise(res => {
+            begin = res;
+        });
+    }
+}
diff --git a/client/src/app/site/common/components/legal-notice/legal-notice.component.html b/client/src/app/site/common/components/legal-notice/legal-notice.component.html
index 31dbb9e57..56136f488 100644
--- a/client/src/app/site/common/components/legal-notice/legal-notice.component.html
+++ b/client/src/app/site/common/components/legal-notice/legal-notice.component.html
@@ -32,6 +32,26 @@
             <span>{{ 'Check for updates' | translate }}</span>
         </button>
     </div>
+
+    <div>
+        <button type="button" mat-button (click)="showDevTools=!showDevTools">
+            <span>{{ 'Show devtools' | translate }}</span>
+        </button>
+    </div>
+
+    <mat-card class="os-card" *ngIf="showDevTools">
+        <div>
+            <button type="button" mat-button (click)="printDS()">
+                <span>Print DS</span>
+            </button>
+        </div>
+
+        <div>
+            <button type="button" mat-button (click)="getThisComponent()">
+                <span>Get this component</span>
+            </button>
+        </div>
+    </mat-card>
 </mat-card>
 
 <mat-card class="os-card" *osPerms="'users.can_manage'">
diff --git a/client/src/app/site/common/components/legal-notice/legal-notice.component.ts b/client/src/app/site/common/components/legal-notice/legal-notice.component.ts
index bbacac6da..fd61ea876 100644
--- a/client/src/app/site/common/components/legal-notice/legal-notice.component.ts
+++ b/client/src/app/site/common/components/legal-notice/legal-notice.component.ts
@@ -4,6 +4,7 @@ import { Title } from '@angular/platform-browser';
 
 import { TranslateService } from '@ngx-translate/core';
 
+import { DataStoreService } from 'app/core/core-services/data-store.service';
 import { OpenSlidesService } from 'app/core/core-services/openslides.service';
 import { OperatorService, Permission } from 'app/core/core-services/operator.service';
 import { ConfigRepositoryService } from 'app/core/repositories/config/config-repository.service';
@@ -25,6 +26,8 @@ export class LegalNoticeComponent extends BaseViewComponent implements OnInit {
      */
     public legalNotice = '';
 
+    public showDevTools = false;
+
     /**
      * Constructor.
      */
@@ -35,7 +38,8 @@ export class LegalNoticeComponent extends BaseViewComponent implements OnInit {
         private openSlidesService: OpenSlidesService,
         private update: UpdateService,
         private configRepo: ConfigRepositoryService,
-        private operator: OperatorService
+        private operator: OperatorService,
+        private DS: DataStoreService
     ) {
         super(title, translate, matSnackbar);
     }
@@ -67,4 +71,12 @@ export class LegalNoticeComponent extends BaseViewComponent implements OnInit {
     public canManage(): boolean {
         return this.operator.hasPerms(Permission.coreCanManageConfig);
     }
+
+    public printDS(): void {
+        this.DS.print();
+    }
+
+    public getThisComponent(): void {
+        console.log(this);
+    }
 }
diff --git a/client/src/app/site/motions/modules/motion-detail/components/motion-detail/motion-detail.component.ts b/client/src/app/site/motions/modules/motion-detail/components/motion-detail/motion-detail.component.ts
index beda8a319..8cf8d31c9 100644
--- a/client/src/app/site/motions/modules/motion-detail/components/motion-detail/motion-detail.component.ts
+++ b/client/src/app/site/motions/modules/motion-detail/components/motion-detail/motion-detail.component.ts
@@ -554,7 +554,7 @@ export class MotionDetailComponent extends BaseViewComponent implements OnInit,
             this.motionFilterService.initFilters(this.motionObserver);
             this.motionSortService.initSorting(this.motionFilterService.outputObservable);
             this.sortedMotionsObservable = this.motionSortService.outputObservable;
-        } else if (this.motion.parent_id) {
+        } else if (this.motion && this.motion.parent_id) {
             // only use the amendments for this motion
             this.amendmentFilterService.initFilters(this.repo.amendmentsTo(this.motion.parent_id));
             this.amendmentSortService.initSorting(this.amendmentFilterService.outputObservable);
diff --git a/client/src/app/site/polls/components/poll-progress/poll-progress.component.html b/client/src/app/site/polls/components/poll-progress/poll-progress.component.html
index 6a5f5cfb5..f8cffffd3 100644
--- a/client/src/app/site/polls/components/poll-progress/poll-progress.component.html
+++ b/client/src/app/site/polls/components/poll-progress/poll-progress.component.html
@@ -1,6 +1,6 @@
 <div *ngIf="poll" class="poll-progress-wrapper">
     <div class="vote-number">
-        <span>{{ poll.votescast }} / {{ max }}</span>
+        <span>{{ votescast }} / {{ max }}</span>
     </div>
 
     <span>{{ 'Received votes' | translate }}</span>
diff --git a/client/src/app/site/polls/components/poll-progress/poll-progress.component.ts b/client/src/app/site/polls/components/poll-progress/poll-progress.component.ts
index 8ecedb614..909f86df0 100644
--- a/client/src/app/site/polls/components/poll-progress/poll-progress.component.ts
+++ b/client/src/app/site/polls/components/poll-progress/poll-progress.component.ts
@@ -1,58 +1,98 @@
-import { Component, Input, OnInit } from '@angular/core';
+import { Component, Input } from '@angular/core';
 import { MatSnackBar } from '@angular/material/snack-bar';
 import { Title } from '@angular/platform-browser';
 
 import { TranslateService } from '@ngx-translate/core';
-import { map } from 'rxjs/operators';
+import { Subscription } from 'rxjs';
 
+import { MotionPollRepositoryService } from 'app/core/repositories/motions/motion-poll-repository.service';
 import { UserRepositoryService } from 'app/core/repositories/users/user-repository.service';
 import { BaseViewComponent } from 'app/site/base/base-view';
 import { ViewBasePoll } from 'app/site/polls/models/view-base-poll';
+import { ViewUser } from 'app/site/users/models/view-user';
 
 @Component({
     selector: 'os-poll-progress',
     templateUrl: './poll-progress.component.html',
     styleUrls: ['./poll-progress.component.scss']
 })
-export class PollProgressComponent extends BaseViewComponent implements OnInit {
-    @Input()
-    public poll: ViewBasePoll;
+export class PollProgressComponent extends BaseViewComponent {
+    private pollId: number = null;
+    private pollSubscription: Subscription = null;
 
+    @Input()
+    public set poll(value: ViewBasePoll) {
+        if (value.id !== this.pollId) {
+            this.pollId = value.id;
+
+            if (this.pollSubscription !== null) {
+                this.pollSubscription.unsubscribe();
+                this.pollSubscription = null;
+            }
+
+            this.pollSubscription = this.pollRepo.getViewModelObservable(this.pollId).subscribe(poll => {
+                if (poll) {
+                    this._poll = poll;
+
+                    // We may cannot use this.poll.votescast during the voting, since it can
+                    // be reported with false values from the server
+                    // -> calculate the votes on our own.
+                    const ids = new Set();
+                    for (const option of this.poll.options) {
+                        for (const vote of option.votes) {
+                            if (vote.user_id) {
+                                ids.add(vote.user_id);
+                            }
+                        }
+                    }
+                    this.votescast = ids.size;
+
+                    // But sometimes there are not enough votes (poll.votescast is higher).
+                    // If this happens, take the value from the poll
+                    if (this.poll.votescast > this.votescast) {
+                        this.votescast = this.poll.votescast;
+                    }
+
+                    this.calculateMaxUsers();
+                }
+            });
+        }
+    }
+    public get poll(): ViewBasePoll {
+        return this._poll;
+    }
+    private _poll: ViewBasePoll;
+
+    public votescast: number;
     public max: number;
+    public valueInPercent: number;
 
     public constructor(
         title: Title,
         protected translate: TranslateService,
         snackbar: MatSnackBar,
-        private userRepo: UserRepositoryService
+        private userRepo: UserRepositoryService,
+        private pollRepo: MotionPollRepositoryService
     ) {
         super(title, translate, snackbar);
+        this.userRepo.getViewModelListObservable().subscribe(users => {
+            if (users) {
+                this.calculateMaxUsers(users);
+            }
+        });
     }
 
-    public get valueInPercent(): number {
-        if (this.poll) {
-            return (this.poll.votesvalid / this.max) * 100;
-        } else {
-            return 0;
+    private calculateMaxUsers(allUsers?: ViewUser[]): void {
+        if (!this.poll) {
+            return;
+        }
+        if (!allUsers) {
+            allUsers = this.userRepo.getViewModelList();
         }
-    }
 
-    /**
-     * OnInit.
-     * Sets the observable for groups.
-     */
-    public ngOnInit(): void {
-        if (this.poll) {
-            this.userRepo
-                .getViewModelListObservable()
-                .pipe(
-                    map(users =>
-                        users.filter(user => user.is_present && this.poll.groups_id.intersect(user.groups_id).length)
-                    )
-                )
-                .subscribe(users => {
-                    this.max = users.length;
-                });
-        }
+        allUsers = allUsers.filter(user => user.is_present && this.poll.groups_id.intersect(user.groups_id).length);
+
+        this.max = allUsers.length;
+        this.valueInPercent = this.poll ? (this.votescast / this.max) * 100 : 0;
     }
 }
diff --git a/openslides/agenda/projector.py b/openslides/agenda/projector.py
index 36d0a47d4..eb8b305ca 100644
--- a/openslides/agenda/projector.py
+++ b/openslides/agenda/projector.py
@@ -3,9 +3,10 @@ from typing import Any, Dict, List, Union
 
 from ..users.projector import get_user_name
 from ..utils.projector import (
-    AllData,
+    ProjectorAllDataProvider,
     ProjectorElementException,
     get_config,
+    get_model,
     register_projector_slide,
 )
 
@@ -15,20 +16,24 @@ from ..utils.projector import (
 #            side effects.
 
 
-async def get_sorted_agenda_items(all_data: AllData) -> List[Dict[str, Any]]:
+async def get_sorted_agenda_items(
+    agenda_items: Dict[int, Dict[str, Any]]
+) -> List[Dict[str, Any]]:
     """
     Returns all sorted agenda items by id first and then weight, resulting in
     ordered items, if some have the same weight.
     """
     return sorted(
-        sorted(all_data["agenda/item"].values(), key=lambda item: item["id"]),
+        sorted(agenda_items.values(), key=lambda item: item["id"]),
         key=lambda item: item["weight"],
     )
 
 
-async def get_flat_tree(all_data: AllData, parent_id: int = 0) -> List[Dict[str, Any]]:
+async def get_flat_tree(
+    agenda_items: Dict[int, Dict[str, Any]], parent_id: int = 0
+) -> List[Dict[str, Any]]:
     """
-    Build the item tree from all_data.
+    Build the item tree from all_data_provider.
 
     Only build the tree from elements unterneath parent_id.
 
@@ -38,16 +43,16 @@ async def get_flat_tree(all_data: AllData, parent_id: int = 0) -> List[Dict[str,
 
     # Build a dict from an item_id to all its children
     children: Dict[int, List[int]] = defaultdict(list)
-    if "agenda/item" in all_data:
-        for item in await get_sorted_agenda_items(all_data):
-            if item["type"] == 1:  # only normal items
-                children[item["parent_id"] or 0].append(item["id"])
+
+    for item in await get_sorted_agenda_items(agenda_items):
+        if item["type"] == 1:  # only normal items
+            children[item["parent_id"] or 0].append(item["id"])
 
     tree = []
 
-    async def get_children(item_ids: List[int], depth: int) -> None:
+    def build_tree(item_ids: List[int], depth: int) -> None:
         for item_id in item_ids:
-            item = all_data["agenda/item"][item_id]
+            item = agenda_items[item_id]
             title_information = item["title_information"]
             title_information["_agenda_item_number"] = item["item_number"]
             tree.append(
@@ -57,25 +62,29 @@ async def get_flat_tree(all_data: AllData, parent_id: int = 0) -> List[Dict[str,
                     "depth": depth,
                 }
             )
-            await get_children(children[item_id], depth + 1)
+            build_tree(children[item_id], depth + 1)
 
-    await get_children(children[parent_id], 0)
+    build_tree(children[parent_id], 0)
     return tree
 
 
 async def item_list_slide(
-    all_data: AllData, element: Dict[str, Any], projector_id: int
+    all_data_provider: ProjectorAllDataProvider,
+    element: Dict[str, Any],
+    projector_id: int,
 ) -> Dict[str, Any]:
     """
     Item list slide.
 
     Returns all root items or all children of an item.
     """
-    only_main_items = element.get("only_main_items", True)
+    # fetch all items, so they are cached:
+    all_agenda_items = await all_data_provider.get_collection("agenda/item")
 
+    only_main_items = element.get("only_main_items", True)
     if only_main_items:
         agenda_items = []
-        for item in await get_sorted_agenda_items(all_data):
+        for item in await get_sorted_agenda_items(all_agenda_items):
             if item["parent_id"] is None and item["type"] == 1:
                 title_information = item["title_information"]
                 title_information["_agenda_item_number"] = item["item_number"]
@@ -86,13 +95,15 @@ async def item_list_slide(
                     }
                 )
     else:
-        agenda_items = await get_flat_tree(all_data)
+        agenda_items = await get_flat_tree(all_agenda_items)
 
     return {"items": agenda_items}
 
 
 async def list_of_speakers_slide(
-    all_data: AllData, element: Dict[str, Any], projector_id: int
+    all_data_provider: ProjectorAllDataProvider,
+    element: Dict[str, Any],
+    projector_id: int,
 ) -> Dict[str, Any]:
     """
     List of speakers slide.
@@ -104,35 +115,35 @@ async def list_of_speakers_slide(
     if list_of_speakers_id is None:
         raise ProjectorElementException("id is required for list of speakers slide")
 
-    return await get_list_of_speakers_slide_data(all_data, list_of_speakers_id)
+    return await get_list_of_speakers_slide_data(all_data_provider, list_of_speakers_id)
 
 
 async def get_list_of_speakers_slide_data(
-    all_data: AllData, list_of_speakers_id: int
+    all_data_provider: ProjectorAllDataProvider, list_of_speakers_id: int
 ) -> Dict[str, Any]:
-    try:
-        list_of_speakers = all_data["agenda/list-of-speakers"][list_of_speakers_id]
-    except KeyError:
-        raise ProjectorElementException(
-            f"List of speakers {list_of_speakers_id} does not exist"
-        )
+    list_of_speakers = await get_model(
+        all_data_provider, "agenda/list-of-speakers", list_of_speakers_id
+    )
 
     title_information = list_of_speakers["title_information"]
     # try to get the agenda item for the content object (which must not exist)
-    agenda_item_id = all_data[list_of_speakers["content_object"]["collection"]][
-        list_of_speakers["content_object"]["id"]
-    ].get("agenda_item_id")
-    if agenda_item_id:
-        title_information["_agenda_item_number"] = all_data["agenda/item"][
-            agenda_item_id
-        ]["item_number"]
+    content_object = await get_model(
+        all_data_provider,
+        list_of_speakers["content_object"]["collection"],
+        list_of_speakers["content_object"]["id"],
+    )
+    agenda_item_id = content_object.get("agenda_item_id")
+    if agenda_item_id is not None:
+        agenda_item = await all_data_provider.get("agenda/item", agenda_item_id)
+        if agenda_item is not None:
+            title_information["_agenda_item_number"] = agenda_item["item_number"]
 
     # Partition speaker objects to waiting, current and finished
     speakers_waiting = []
     speakers_finished = []
     current_speaker = None
     for speaker in list_of_speakers["speakers"]:
-        user = await get_user_name(all_data, speaker["user_id"])
+        user = await get_user_name(all_data_provider, speaker["user_id"])
         formatted_speaker = {
             "user": user,
             "marked": speaker["marked"],
@@ -151,8 +162,12 @@ async def get_list_of_speakers_slide_data(
     speakers_waiting = sorted(speakers_waiting, key=lambda s: s["weight"])
     speakers_finished = sorted(speakers_finished, key=lambda s: s["end_time"])
 
-    number_of_last_speakers = await get_config(all_data, "agenda_show_last_speakers")
-    number_of_next_speakers = await get_config(all_data, "agenda_show_next_speakers")
+    number_of_last_speakers = await get_config(
+        all_data_provider, "agenda_show_last_speakers"
+    )
+    number_of_next_speakers = await get_config(
+        all_data_provider, "agenda_show_next_speakers"
+    )
 
     if number_of_last_speakers == 0:
         speakers_finished = []
@@ -174,7 +189,7 @@ async def get_list_of_speakers_slide_data(
 
 
 async def get_current_list_of_speakers_id_for_projector(
-    all_data: AllData, projector: Dict[str, Any]
+    all_data_provider: ProjectorAllDataProvider, projector: Dict[str, Any]
 ) -> Union[int, None]:
     """
     Search for elements, that do have a list of speakers:
@@ -189,94 +204,88 @@ async def get_current_list_of_speakers_id_for_projector(
             continue
         collection = element["name"]
         id = element["id"]
-        if collection not in all_data or id not in all_data[collection]:
+        model = await all_data_provider.get(collection, id)
+        if model is None:
             continue
 
-        model = all_data[collection][id]
         if "list_of_speakers_id" not in model:
             continue
 
-        if not model["list_of_speakers_id"] in all_data["agenda/list-of-speakers"]:
+        list_of_speakers_id = model["list_of_speakers_id"]
+        los_exists = await all_data_provider.exists(
+            "agenda/list-of-speakers", list_of_speakers_id
+        )
+        if not los_exists:
             continue
 
-        list_of_speakers_id = model["list_of_speakers_id"]
         break
 
     return list_of_speakers_id
 
 
 async def get_reference_projector(
-    all_data: AllData, projector_id: int
+    all_data_provider: ProjectorAllDataProvider, projector_id: int
 ) -> Dict[str, Any]:
     """
     Returns the reference projector to the given projector (by id)
     """
-    try:
-        this_projector = all_data["core/projector"][projector_id]
-    except KeyError:
-        raise ProjectorElementException(f"Projector {projector_id} does not exist")
+    this_projector = await get_model(all_data_provider, "core/projector", projector_id)
 
     reference_projector_id = this_projector["reference_projector_id"] or projector_id
-    try:
-        reference_projector = all_data["core/projector"][reference_projector_id]
-    except KeyError:
-        raise ProjectorElementException(
-            f"Projector {reference_projector_id} does not exist"
-        )
-
-    return reference_projector
+    return await get_model(all_data_provider, "core/projector", reference_projector_id)
 
 
 async def current_list_of_speakers_slide(
-    all_data: AllData, element: Dict[str, Any], projector_id: int
+    all_data_provider: ProjectorAllDataProvider,
+    element: Dict[str, Any],
+    projector_id: int,
 ) -> Dict[str, Any]:
     """
     The current list of speakers slide. Creates the data for the given projector.
     """
-    reference_projector = await get_reference_projector(all_data, projector_id)
+    reference_projector = await get_reference_projector(all_data_provider, projector_id)
     list_of_speakers_id = await get_current_list_of_speakers_id_for_projector(
-        all_data, reference_projector
+        all_data_provider, reference_projector
     )
     if list_of_speakers_id is None:  # no element found
         return {}
 
-    return await get_list_of_speakers_slide_data(all_data, list_of_speakers_id)
+    return await get_list_of_speakers_slide_data(all_data_provider, list_of_speakers_id)
 
 
 async def current_speaker_chyron_slide(
-    all_data: AllData, element: Dict[str, Any], projector_id: int
+    all_data_provider: ProjectorAllDataProvider,
+    element: Dict[str, Any],
+    projector_id: int,
 ) -> Dict[str, Any]:
     """
     Returns the username for the current speaker.
     """
     # get projector for color information
-    projector = all_data["core/projector"][projector_id]
+    projector = await get_model(all_data_provider, "core/projector", projector_id)
 
     slide_data = {
         "background_color": projector["chyron_background_color"],
         "font_color": projector["chyron_font_color"],
     }
 
-    reference_projector = await get_reference_projector(all_data, projector_id)
+    reference_projector = await get_reference_projector(all_data_provider, projector_id)
     list_of_speakers_id = await get_current_list_of_speakers_id_for_projector(
-        all_data, reference_projector
+        all_data_provider, reference_projector
     )
     if list_of_speakers_id is None:  # no element found
         return slide_data
 
     # get list of speakers to search current speaker
-    try:
-        list_of_speakers = all_data["agenda/list-of-speakers"][list_of_speakers_id]
-    except KeyError:
-        raise ProjectorElementException(
-            f"List of speakers {list_of_speakers_id} does not exist"
-        )
+    list_of_speakers = await get_model(
+        all_data_provider, "agenda/list-of-speakers", list_of_speakers_id
+    )
 
     # find current speaker
     current_speaker = None
     for speaker in list_of_speakers["speakers"]:
         if speaker["begin_time"] is not None and speaker["end_time"] is None:
-            current_speaker = await get_user_name(all_data, speaker["user_id"])
+            current_speaker = await get_user_name(all_data_provider, speaker["user_id"])
             break
 
     if current_speaker is not None:
diff --git a/openslides/assignments/projector.py b/openslides/assignments/projector.py
index c868ad103..97c0be82a 100644
--- a/openslides/assignments/projector.py
+++ b/openslides/assignments/projector.py
@@ -1,25 +1,29 @@
 from typing import Any, Dict, List
 
 from ..users.projector import get_user_name
-from ..utils.projector import AllData, get_model, get_models, register_projector_slide
+from ..utils.projector import (
+    ProjectorAllDataProvider,
+    get_model,
+    get_models,
+    register_projector_slide,
+)
 from .models import AssignmentPoll
 
 
-# Important: All functions have to be prune. This means, that thay can only
-#            access the data, that they get as argument and do not have any
-#            side effects.
-
-
 async def assignment_slide(
-    all_data: AllData, element: Dict[str, Any], projector_id: int
+    all_data_provider: ProjectorAllDataProvider,
+    element: Dict[str, Any],
+    projector_id: int,
 ) -> Dict[str, Any]:
     """
     Assignment slide.
     """
-    assignment = get_model(all_data, "assignments/assignment", element.get("id"))
+    assignment = await get_model(
+        all_data_provider, "assignments/assignment", element.get("id")
+    )
 
     assignment_related_users: List[Dict[str, Any]] = [
-        {"user": await get_user_name(all_data, aru["user_id"])}
+        {"user": await get_user_name(all_data_provider, aru["user_id"])}
         for aru in sorted(
             assignment["assignment_related_users"], key=lambda aru: aru["weight"]
         )
@@ -36,13 +40,19 @@ async def assignment_slide(
 
 
 async def assignment_poll_slide(
-    all_data: AllData, element: Dict[str, Any], projector_id: int
+    all_data_provider: ProjectorAllDataProvider,
+    element: Dict[str, Any],
+    projector_id: int,
 ) -> Dict[str, Any]:
     """
     Poll slide.
     """
-    poll = get_model(all_data, "assignments/assignment-poll", element.get("id"))
-    assignment = get_model(all_data, "assignments/assignment", poll["assignment_id"])
+    poll = await get_model(
+        all_data_provider, "assignments/assignment-poll", element.get("id")
+    )
+    assignment = await get_model(
+        all_data_provider, "assignments/assignment", poll["assignment_id"]
+    )
 
     poll_data = {
         key: poll[key]
@@ -60,10 +70,14 @@ async def assignment_poll_slide(
 
     # Add options:
     poll_data["options"] = []
-    options = get_models(all_data, "assignments/assignment-option", poll["options_id"])
+    options = await get_models(
+        all_data_provider, "assignments/assignment-option", poll["options_id"]
+    )
     for option in sorted(options, key=lambda option: option["weight"]):
         option_data: Dict[str, Any] = {
-            "user": {"short_name": await get_user_name(all_data, option["user_id"])}
+            "user": {
+                "short_name": await get_user_name(all_data_provider, option["user_id"])
+            }
         }
         if poll["state"] == AssignmentPoll.STATE_PUBLISHED:
             option_data["yes"] = float(option["yes"])
diff --git a/openslides/core/apps.py b/openslides/core/apps.py
index 3b4711b6e..3481e402a 100644
--- a/openslides/core/apps.py
+++ b/openslides/core/apps.py
@@ -34,16 +34,10 @@ class CoreAppConfig(AppConfig):
             ProjectionDefaultViewSet,
             TagViewSet,
         )
-        from .websocket import (
-            NotifyWebsocketClientMessage,
-            ConstantsWebsocketClientMessage,
-            GetElementsWebsocketClientMessage,
-            AutoupdateWebsocketClientMessage,
-            ListenToProjectors,
-            PingPong,
-        )
         from ..utils.rest_api import router
-        from ..utils.websocket import register_client_message
+
+        # Let all client websocket message register
+        from ..utils import websocket_client_messages  # noqa
 
         # Collect all config variables before getting the constants.
         config.collect_config_variables_from_apps()
@@ -92,14 +86,6 @@ class CoreAppConfig(AppConfig):
             self.get_model("Countdown").get_collection_string(), CountdownViewSet
         )
 
-        # Register client messages
-        register_client_message(NotifyWebsocketClientMessage())
-        register_client_message(ConstantsWebsocketClientMessage())
-        register_client_message(GetElementsWebsocketClientMessage())
-        register_client_message(AutoupdateWebsocketClientMessage())
-        register_client_message(ListenToProjectors())
-        register_client_message(PingPong())
-
         if "runserver" in sys.argv or "changeconfig" in sys.argv:
             from openslides.utils.startup import run_startup_hooks
 
diff --git a/openslides/core/projector.py b/openslides/core/projector.py
index 9bbf75942..3c9f2ed82 100644
--- a/openslides/core/projector.py
+++ b/openslides/core/projector.py
@@ -1,20 +1,17 @@
 from typing import Any, Dict
 
 from ..utils.projector import (
-    AllData,
-    ProjectorElementException,
+    ProjectorAllDataProvider,
     get_config,
+    get_model,
     register_projector_slide,
 )
 
 
-# Important: All functions have to be prune. This means, that thay can only
-#            access the data, that they get as argument and do not have any
-#            side effects.
-
-
 async def countdown_slide(
-    all_data: AllData, element: Dict[str, Any], projector_id: int
+    all_data_provider: ProjectorAllDataProvider,
+    element: Dict[str, Any],
+    projector_id: int,
 ) -> Dict[str, Any]:
     """
     Countdown slide.
@@ -26,23 +23,21 @@ async def countdown_slide(
         id: 5,  # Countdown ID
     }
     """
-    countdown_id = element.get("id") or 1
-
-    try:
-        countdown = all_data["core/countdown"][countdown_id]
-    except KeyError:
-        raise ProjectorElementException(f"Countdown {countdown_id} does not exist")
-
+    countdown = await get_model(all_data_provider, "core/countdown", element.get("id"))
     return {
         "description": countdown["description"],
         "running": countdown["running"],
         "countdown_time": countdown["countdown_time"],
-        "warning_time": await get_config(all_data, "agenda_countdown_warning_time"),
+        "warning_time": await get_config(
+            all_data_provider, "agenda_countdown_warning_time"
+        ),
     }
 
 
 async def message_slide(
-    all_data: AllData, element: Dict[str, Any], projector_id: int
+    all_data_provider: ProjectorAllDataProvider,
+    element: Dict[str, Any],
+    projector_id: int,
 ) -> Dict[str, Any]:
     """
     Message slide.
@@ -54,16 +49,15 @@ async def message_slide(
         id: 5,  # ProjectorMessage ID
     }
     """
-    message_id = element.get("id") or 1
-
-    try:
-        return all_data["core/projector-message"][message_id]
-    except KeyError:
-        raise ProjectorElementException(f"Message {message_id} does not exist")
+    return await get_model(
+        all_data_provider, "core/projector-message", element.get("id")
+    )
 
 
 async def clock_slide(
-    all_data: AllData, element: Dict[str, Any], projector_id: int
+    all_data_provider: ProjectorAllDataProvider,
+    element: Dict[str, Any],
+    projector_id: int,
 ) -> Dict[str, Any]:
     return {}
 
diff --git a/openslides/mediafiles/projector.py b/openslides/mediafiles/projector.py
index 196d5e8c8..b996c823f 100644
--- a/openslides/mediafiles/projector.py
+++ b/openslides/mediafiles/projector.py
@@ -1,35 +1,23 @@
 from typing import Any, Dict
 
 from ..utils.projector import (
-    AllData,
-    ProjectorElementException,
+    ProjectorAllDataProvider,
+    get_model,
     register_projector_slide,
 )
 
 
-# Important: All functions have to be prune. This means, that thay can only
-#            access the data, that they get as argument and do not have any
-#            side effects.
-
-
 async def mediafile_slide(
-    all_data: AllData, element: Dict[str, Any], projector_id: int
+    all_data_provider: ProjectorAllDataProvider,
+    element: Dict[str, Any],
+    projector_id: int,
 ) -> Dict[str, Any]:
     """
     Slide for Mediafile.
     """
-    mediafile_id = element.get("id")
-
-    if mediafile_id is None:
-        raise ProjectorElementException("id is required for mediafile slide")
-
-    try:
-        mediafile = all_data["mediafiles/mediafile"][mediafile_id]
-    except KeyError:
-        raise ProjectorElementException(
-            f"mediafile with id {mediafile_id} does not exist"
-        )
-
+    mediafile = await get_model(
+        all_data_provider, "mediafiles/mediafile", element.get("id")
+    )
     return {
         "path": mediafile["path"],
         "mimetype": mediafile["mimetype"],
diff --git a/openslides/motions/projector.py b/openslides/motions/projector.py
index 74a9a399f..c7a39040c 100644
--- a/openslides/motions/projector.py
+++ b/openslides/motions/projector.py
@@ -3,7 +3,7 @@ from typing import Any, Dict, List, Optional
 
 from ..users.projector import get_user_name
 from ..utils.projector import (
-    AllData,
+    ProjectorAllDataProvider,
     ProjectorElementException,
     get_config,
     get_model,
@@ -14,33 +14,31 @@ from .models import MotionPoll
 
 motion_placeholder_regex = re.compile(r"\[motion:(\d+)\]")
 
-# Important: All functions have to be prune. This means, that thay can only
-#            access the data, that they get as argument and do not have any
-#            side effects.
-
 
 async def get_state(
-    all_data: AllData, motion: Dict[str, Any], state_id_key: str
+    all_data_provider: ProjectorAllDataProvider,
+    motion: Dict[str, Any],
+    state_id_key: str,
 ) -> Dict[str, Any]:
     """
     Returns a state element from one motion. Raises an error if the state does not exist.
     """
-    state = all_data["motions/state"].get(motion[state_id_key])
-    if not state:
+    state = await all_data_provider.get("motions/state", motion[state_id_key])
+    if state is None:
         raise ProjectorElementException(
             f"motion {motion['id']} can not be on the state with id {motion[state_id_key]}"
         )
     return state
 
 
-async def get_amendment_merge_into_motion_diff(all_data, amendment):
+async def get_amendment_merge_into_motion_diff(all_data_provider, amendment):
     """
     HINT: This implementation should be consistent to showInDiffView() in ViewMotionAmendedParagraph.ts
     """
     if amendment["state_id"] is None:
         return 0
 
-    state = await get_state(all_data, amendment, "state_id")
+    state = await get_state(all_data_provider, amendment, "state_id")
     if state["merge_amendment_into_final"] == -1:
         return 0
     if state["merge_amendment_into_final"] == 1:
@@ -48,36 +46,37 @@ async def get_amendment_merge_into_motion_diff(all_data, amendment):
 
     if amendment["recommendation_id"] is None:
         return 0
-    recommendation = await get_state(all_data, amendment, "recommendation_id")
+    recommendation = await get_state(all_data_provider, amendment, "recommendation_id")
     if recommendation["merge_amendment_into_final"] == 1:
         return 1
 
     return 0
 
 
-async def get_amendment_merge_into_motion_final(all_data, amendment):
+async def get_amendment_merge_into_motion_final(all_data_provider, amendment):
     """
     HINT: This implementation should be consistent to showInFinalView() in ViewMotionAmendedParagraph.ts
     """
     if amendment["state_id"] is None:
         return 0
 
-    state = await get_state(all_data, amendment, "state_id")
+    state = await get_state(all_data_provider, amendment, "state_id")
     if state["merge_amendment_into_final"] == 1:
         return 1
 
     return 0
 
 
-async def get_amendments_for_motion(motion, all_data):
+async def get_amendments_for_motion(motion, all_data_provider):
     amendment_data = []
-    for amendment_id, amendment in all_data["motions/motion"].items():
+    all_motions = await all_data_provider.get_collection("motions/motion")
+    for amendment_id, amendment in all_motions.items():
         if amendment["parent_id"] == motion["id"]:
             merge_amendment_into_final = await get_amendment_merge_into_motion_final(
-                all_data, amendment
+                all_data_provider, amendment
             )
             merge_amendment_into_diff = await get_amendment_merge_into_motion_diff(
-                all_data, amendment
+                all_data_provider, amendment
             )
             amendment_data.append(
                 {
@@ -92,8 +91,10 @@ async def get_amendments_for_motion(motion, all_data):
     return amendment_data
 
 
-async def get_amendment_base_motion(amendment, all_data):
-    motion = get_model(all_data, "motions/motion", amendment.get("parent_id"))
+async def get_amendment_base_motion(amendment, all_data_provider):
+    motion = await get_model(
+        all_data_provider, "motions/motion", amendment.get("parent_id")
+    )
 
     return {
         "identifier": motion["identifier"],
@@ -102,15 +103,17 @@ async def get_amendment_base_motion(amendment, all_data):
     }
 
 
-async def get_amendment_base_statute(amendment, all_data):
-    statute = get_model(
-        all_data, "motions/statute-paragraph", amendment.get("statute_paragraph_id")
+async def get_amendment_base_statute(amendment, all_data_provider):
+    statute = await get_model(
+        all_data_provider,
+        "motions/statute-paragraph",
+        amendment.get("statute_paragraph_id"),
     )
     return {"title": statute["title"], "text": statute["text"]}
 
 
 async def extend_reference_motion_dict(
-    all_data: AllData,
+    all_data_provider: ProjectorAllDataProvider,
     recommendation: Optional[str],
     referenced_motions: Dict[int, Dict[str, str]],
 ) -> None:
@@ -127,15 +130,18 @@ async def extend_reference_motion_dict(
     ]
     for id in referenced_ids:
         # Put every referenced motion into the referenced_motions dict
-        if id not in referenced_motions and id in all_data["motions/motion"]:
+        referenced_motion = await all_data_provider.get("motions/motion", id)
+        if id not in referenced_motions and referenced_motion is not None:
             referenced_motions[id] = {
-                "title": all_data["motions/motion"][id]["title"],
-                "identifier": all_data["motions/motion"][id]["identifier"],
+                "title": referenced_motion["title"],
+                "identifier": referenced_motion["identifier"],
             }
 
 
 async def motion_slide(
-    all_data: AllData, element: Dict[str, Any], projector_id: int
+    all_data_provider: ProjectorAllDataProvider,
+    element: Dict[str, Any],
+    projector_id: int,
 ) -> Dict[str, Any]:
     """
     Motion slide.
@@ -158,13 +164,16 @@ async def motion_slide(
     """
     # Get motion
     mode = element.get(
-        "mode", await get_config(all_data, "motions_recommendation_text_mode")
+        "mode", await get_config(all_data_provider, "motions_recommendation_text_mode")
     )
-    motion = get_model(all_data, "motions/motion", element.get("id"))
+
+    # populate cache:
+
+    motion = await get_model(all_data_provider, "motions/motion", element.get("id"))
 
     # Add submitters
     submitters = [
-        await get_user_name(all_data, submitter["user_id"])
+        await get_user_name(all_data_provider, submitter["user_id"])
         for submitter in sorted(
             motion["submitters"], key=lambda submitter: submitter["weight"]
         )
@@ -172,14 +181,16 @@ async def motion_slide(
 
     # Get some needed config values
     show_meta_box = not await get_config(
-        all_data, "motions_disable_sidebox_on_projector"
+        all_data_provider, "motions_disable_sidebox_on_projector"
     )
     show_referring_motions = not await get_config(
-        all_data, "motions_hide_referring_motions"
+        all_data_provider, "motions_hide_referring_motions"
     )
-    line_length = await get_config(all_data, "motions_line_length")
-    line_numbering_mode = await get_config(all_data, "motions_default_line_numbering")
-    motions_preamble = await get_config(all_data, "motions_preamble")
+    line_length = await get_config(all_data_provider, "motions_line_length")
+    line_numbering_mode = await get_config(
+        all_data_provider, "motions_default_line_numbering"
+    )
+    motions_preamble = await get_config(all_data_provider, "motions_preamble")
 
     # Query all change-recommendation and amendment related things.
     change_recommendations = []  # type: ignore
@@ -187,17 +198,19 @@ async def motion_slide(
     base_motion = None
     base_statute = None
     if motion["statute_paragraph_id"]:
-        base_statute = await get_amendment_base_statute(motion, all_data)
+        base_statute = await get_amendment_base_statute(motion, all_data_provider)
     elif motion["parent_id"] is not None and motion["amendment_paragraphs"]:
-        base_motion = await get_amendment_base_motion(motion, all_data)
+        base_motion = await get_amendment_base_motion(motion, all_data_provider)
     else:
         for change_recommendation_id in motion["change_recommendations_id"]:
-            cr = all_data["motions/motion-change-recommendation"].get(
-                change_recommendation_id
+            cr = await get_model(
+                all_data_provider,
+                "motions/motion-change-recommendation",
+                change_recommendation_id,
             )
             if cr is not None and not cr["internal"]:
                 change_recommendations.append(cr)
-        amendments = await get_amendments_for_motion(motion, all_data)
+        amendments = await get_amendments_for_motion(motion, all_data_provider)
 
     # The base return value. More fields will get added below.
     return_value = {
@@ -217,10 +230,10 @@ async def motion_slide(
         "line_numbering_mode": line_numbering_mode,
     }
 
-    if not await get_config(all_data, "motions_disable_text_on_projector"):
+    if not await get_config(all_data_provider, "motions_disable_text_on_projector"):
         return_value["text"] = motion["text"]
 
-    if not await get_config(all_data, "motions_disable_reason_on_projector"):
+    if not await get_config(all_data_provider, "motions_disable_reason_on_projector"):
         return_value["reason"] = motion["reason"]
 
     if mode == "final":
@@ -228,40 +241,46 @@ async def motion_slide(
 
     # Add recommendation, if enabled in config (and the motion has one)
     if (
-        not await get_config(all_data, "motions_disable_recommendation_on_projector")
+        not await get_config(
+            all_data_provider, "motions_disable_recommendation_on_projector"
+        )
         and motion["recommendation_id"]
     ):
-        recommendation_state = await get_state(all_data, motion, "recommendation_id")
+        recommendation_state = await get_state(
+            all_data_provider, motion, "recommendation_id"
+        )
         return_value["recommendation"] = recommendation_state["recommendation_label"]
         if recommendation_state["show_recommendation_extension_field"]:
             recommendation_extension = motion["recommendation_extension"]
             # All title information for referenced motions in the recommendation
             referenced_motions: Dict[int, Dict[str, str]] = {}
             await extend_reference_motion_dict(
-                all_data, recommendation_extension, referenced_motions
+                all_data_provider, recommendation_extension, referenced_motions
             )
             return_value["recommendation_extension"] = recommendation_extension
             return_value["referenced_motions"] = referenced_motions
         if motion["statute_paragraph_id"]:
             return_value["recommender"] = await get_config(
-                all_data, "motions_statute_recommendations_by"
+                all_data_provider, "motions_statute_recommendations_by"
             )
         else:
             return_value["recommender"] = await get_config(
-                all_data, "motions_recommendations_by"
+                all_data_provider, "motions_recommendations_by"
             )
 
     if show_referring_motions:
         # Add recommendation-referencing motions
         return_value[
             "recommendation_referencing_motions"
-        ] = await get_recommendation_referencing_motions(all_data, motion["id"])
+        ] = await get_recommendation_referencing_motions(
+            all_data_provider, motion["id"]
+        )
 
     return return_value
 
 
 async def get_recommendation_referencing_motions(
-    all_data: AllData, motion_id: int
+    all_data_provider: ProjectorAllDataProvider, motion_id: int
 ) -> Optional[List[Dict[str, Any]]]:
     """
     Returns all title information for motions, that are referencing
@@ -269,14 +288,15 @@ async def get_recommendation_referencing_motions(
     motions, None is returned (instead of []).
     """
     recommendation_referencing_motions = []
-    for motion in all_data["motions/motion"].values():
+    all_motions = await all_data_provider.get_collection("motions/motion")
+    for motion in all_motions.values():
         # Motion must have a recommendation and a recommendaiton extension
         if not motion["recommendation_id"] or not motion["recommendation_extension"]:
             continue
 
         # The recommendation must allow the extension field (there might be left-overs
         # in a motions recommendation extension..)
-        recommendation = await get_state(all_data, motion, "recommendation_id")
+        recommendation = await get_state(all_data_provider, motion, "recommendation_id")
         if not recommendation["show_recommendation_extension_field"]:
             continue
 
@@ -297,12 +317,16 @@ async def get_recommendation_referencing_motions(
 
 
 async def motion_block_slide(
-    all_data: AllData, element: Dict[str, Any], projector_id: int
+    all_data_provider: ProjectorAllDataProvider,
+    element: Dict[str, Any],
+    projector_id: int,
 ) -> Dict[str, Any]:
     """
     Motion block slide.
     """
-    motion_block = get_model(all_data, "motions/motion-block", element.get("id"))
+    motion_block = await get_model(
+        all_data_provider, "motions/motion-block", element.get("id")
+    )
 
     # All motions in this motion block
     motions = []
@@ -311,7 +335,8 @@ async def motion_block_slide(
     referenced_motions: Dict[int, Dict[str, str]] = {}
 
     # Search motions.
-    for motion in all_data["motions/motion"].values():
+    all_motions = await all_data_provider.get_collection("motions/motion")
+    for motion in all_motions.values():
         if motion["motion_block_id"] == motion_block["id"]:
             motion_object = {
                 "title": motion["title"],
@@ -320,7 +345,9 @@ async def motion_block_slide(
 
             recommendation_id = motion["recommendation_id"]
             if recommendation_id is not None:
-                recommendation = await get_state(all_data, motion, "recommendation_id")
+                recommendation = await get_state(
+                    all_data_provider, motion, "recommendation_id"
+                )
                 motion_object["recommendation"] = {
                     "name": recommendation["recommendation_label"],
                     "css_class": recommendation["css_class"],
@@ -328,7 +355,7 @@ async def motion_block_slide(
                 if recommendation["show_recommendation_extension_field"]:
                     recommendation_extension = motion["recommendation_extension"]
                     await extend_reference_motion_dict(
-                        all_data, recommendation_extension, referenced_motions
+                        all_data_provider, recommendation_extension, referenced_motions
                     )
                     motion_object["recommendation_extension"] = recommendation_extension
 
@@ -342,13 +369,15 @@ async def motion_block_slide(
 
 
 async def motion_poll_slide(
-    all_data: AllData, element: Dict[str, Any], projector_id: int
+    all_data_provider: ProjectorAllDataProvider,
+    element: Dict[str, Any],
+    projector_id: int,
 ) -> Dict[str, Any]:
     """
     Poll slide.
     """
-    poll = get_model(all_data, "motions/motion-poll", element.get("id"))
-    motion = get_model(all_data, "motions/motion", poll["motion_id"])
+    poll = await get_model(all_data_provider, "motions/motion-poll", element.get("id"))
+    motion = await get_model(all_data_provider, "motions/motion", poll["motion_id"])
 
     poll_data = {
         key: poll[key]
@@ -363,8 +392,8 @@ async def motion_poll_slide(
     }
 
     if poll["state"] == MotionPoll.STATE_PUBLISHED:
-        option = get_model(
-            all_data, "motions/motion-option", poll["options_id"][0]
+        option = await get_model(
+            all_data_provider, "motions/motion-option", poll["options_id"][0]
         )  # there can only be exactly one option
         poll_data["options"] = [
             {
diff --git a/openslides/poll/views.py b/openslides/poll/views.py
index fabb87f9a..06da7637b 100644
--- a/openslides/poll/views.py
+++ b/openslides/poll/views.py
@@ -156,9 +156,11 @@ class BasePollViewSet(ModelViewSet):
 
         poll.state = BasePoll.STATE_PUBLISHED
         poll.save()
-        inform_changed_data(vote.user for vote in poll.get_votes().all() if vote.user)
-        inform_changed_data(poll.get_votes())
-        inform_changed_data(poll.get_options())
+        inform_changed_data(
+            (vote.user for vote in poll.get_votes().all() if vote.user), final_data=True
+        )
+        inform_changed_data(poll.get_votes(), final_data=True)
+        inform_changed_data(poll.get_options(), final_data=True)
         return Response()
 
     @detail_route(methods=["POST"])
diff --git a/openslides/topics/projector.py b/openslides/topics/projector.py
index 18306aa81..3687c0f31 100644
--- a/openslides/topics/projector.py
+++ b/openslides/topics/projector.py
@@ -1,19 +1,16 @@
 from typing import Any, Dict
 
 from ..utils.projector import (
-    AllData,
-    ProjectorElementException,
+    ProjectorAllDataProvider,
+    get_model,
     register_projector_slide,
 )
 
 
-# Important: All functions have to be prune. This means, that thay can only
-#            access the data, that they get as argument and do not have any
-#            side effects.
-
-
 async def topic_slide(
-    all_data: AllData, element: Dict[str, Any], projector_id: int
+    all_data_provider: ProjectorAllDataProvider,
+    element: Dict[str, Any],
+    projector_id: int,
 ) -> Dict[str, Any]:
     """
     Topic slide.
@@ -22,22 +19,8 @@ async def topic_slide(
     * title
     * text
     """
-    topic_id = element.get("id")
-
-    if topic_id is None:
-        raise ProjectorElementException("id is required for topic slide")
-
-    try:
-        topic = all_data["topics/topic"][topic_id]
-    except KeyError:
-        raise ProjectorElementException(f"topic with id {topic_id} does not exist")
-
-    item_id = topic["agenda_item_id"]
-    try:
-        item = all_data["agenda/item"][item_id]
-    except KeyError:
-        raise ProjectorElementException(f"item with id {item_id} does not exist")
-
+    topic = await get_model(all_data_provider, "topics/topic", element.get("id"))
+    item = await get_model(all_data_provider, "agenda/item", topic["agenda_item_id"])
     return {
         "title": topic["title"],
         "text": topic["text"],
diff --git a/openslides/users/projector.py b/openslides/users/projector.py
index c1b02fc85..902a19a59 100644
--- a/openslides/users/projector.py
+++ b/openslides/users/projector.py
@@ -1,19 +1,16 @@
-from typing import Any, Dict, List
+from typing import Any, Dict, List, Optional
 
 from ..utils.projector import (
-    AllData,
-    ProjectorElementException,
+    ProjectorAllDataProvider,
+    get_model,
     register_projector_slide,
 )
 
 
-# Important: All functions have to be prune. This means, that thay can only
-#            access the data, that they get as argument and do not have any
-#            side effects.
-
-
 async def user_slide(
-    all_data: AllData, element: Dict[str, Any], projector_id: int
+    all_data_provider: ProjectorAllDataProvider,
+    element: Dict[str, Any],
+    projector_id: int,
 ) -> Dict[str, Any]:
     """
     User slide.
@@ -21,22 +18,16 @@ async def user_slide(
     The returned dict can contain the following fields:
     * user
     """
-    user_id = element.get("id")
-
-    if user_id is None:
-        raise ProjectorElementException("id is required for user slide")
-
-    return {"user": await get_user_name(all_data, user_id)}
+    return {"user": await get_user_name(all_data_provider, element.get("id"))}
 
 
-async def get_user_name(all_data: AllData, user_id: int) -> str:
+async def get_user_name(
+    all_data_provider: ProjectorAllDataProvider, user_id: Optional[int]
+) -> str:
     """
     Returns the short name for an user_id.
     """
-    try:
-        user = all_data["users/user"][user_id]
-    except KeyError:
-        raise ProjectorElementException(f"user with id {user_id} does not exist")
+    user = await get_model(all_data_provider, "users/user", user_id)
 
     name_parts: List[str] = []
     for name_part in ("title", "first_name", "last_name"):
diff --git a/openslides/utils/autoupdate.py b/openslides/utils/autoupdate.py
index 7701b1598..d1fffe8df 100644
--- a/openslides/utils/autoupdate.py
+++ b/openslides/utils/autoupdate.py
@@ -1,3 +1,4 @@
+import json
 import threading
 from collections import defaultdict
 from typing import Any, Dict, Iterable, List, Optional, Tuple, Union
@@ -7,9 +8,22 @@ from channels.layers import get_channel_layer
 from django.db.models import Model
 from mypy_extensions import TypedDict
 
-from .cache import element_cache, get_element_id
+from .cache import ChangeIdTooLowError, element_cache, get_element_id
 from .projector import get_projector_data
-from .utils import get_model_from_collection_string, is_iterable
+from .timing import Timing
+from .utils import get_model_from_collection_string, is_iterable, split_element_id
+
+
+AutoupdateFormat = TypedDict(
+    "AutoupdateFormat",
+    {
+        "changed": Dict[str, List[Dict[str, Any]]],
+        "deleted": Dict[str, List[int]],
+        "from_change_id": int,
+        "to_change_id": int,
+        "all_data": bool,
+    },
+)
 
 
 class AutoupdateElementBase(TypedDict):
@@ -66,13 +80,15 @@ class AutoupdateBundle:
                 element["id"]
             ] = element
 
-    def done(self) -> None:
+    def done(self) -> Optional[int]:
         """
         Finishes the bundle by resolving all missing data and passing it to
         the history and element cache.
+
+        Returns the change id, if there are autoupdate elements. Otherwise none.
         """
         if not self.autoupdate_elements:
-            return
+            return None
 
         for collection, elements in self.autoupdate_elements.items():
             # Get all ids, that do not have a full_data key
@@ -92,13 +108,14 @@ class AutoupdateBundle:
                     elements[full_data["id"]]["full_data"] = full_data
 
         # Save histroy here using sync code.
-        save_history(self.elements)
+        save_history(self.element_iterator)
 
         # Update cache and send autoupdate using async code.
-        async_to_sync(self.async_handle_collection_elements)()
+        change_id = async_to_sync(self.dispatch_autoupdate)()
+        return change_id
 
     @property
-    def elements(self) -> Iterable[AutoupdateElement]:
+    def element_iterator(self) -> Iterable[AutoupdateElement]:
         """ Iterator for all elements in this bundle """
         for elements in self.autoupdate_elements.values():
             yield from elements.values()
@@ -110,7 +127,7 @@ class AutoupdateBundle:
         Returns the change_id
         """
         cache_elements: Dict[str, Optional[Dict[str, Any]]] = {}
-        for element in self.elements:
+        for element in self.element_iterator:
             element_id = get_element_id(element["collection_string"], element["id"])
             full_data = element.get("full_data")
             if full_data:
@@ -120,9 +137,11 @@ class AutoupdateBundle:
             cache_elements[element_id] = full_data
         return await element_cache.change_elements(cache_elements)
 
-    async def async_handle_collection_elements(self) -> None:
+    async def dispatch_autoupdate(self) -> int:
         """
         Async helper function to update cache and send autoupdate.
+
+        Return the change_id
         """
         # Update cache
         change_id = await self.update_cache()
@@ -130,21 +149,23 @@ class AutoupdateBundle:
         # Send autoupdate
         channel_layer = get_channel_layer()
         await channel_layer.group_send(
-            "autoupdate", {"type": "send_data", "change_id": change_id}
+            "autoupdate", {"type": "msg_new_change_id", "change_id": change_id}
         )
 
-        projector_data = await get_projector_data()
         # Send projector
+        projector_data = await get_projector_data()
         channel_layer = get_channel_layer()
         await channel_layer.group_send(
             "projector",
             {
-                "type": "projector_changed",
+                "type": "msg_projector_data",
                 "data": projector_data,
                 "change_id": change_id,
             },
         )
 
+        return change_id
+
 
 def inform_changed_data(
     instances: Union[Iterable[Model], Model],
@@ -152,6 +173,7 @@ def inform_changed_data(
     user_id: Optional[int] = None,
     disable_history: bool = False,
     no_delete_on_restriction: bool = False,
+    final_data: bool = False,
 ) -> None:
     """
     Informs the autoupdate system and the caching system about the creation or
@@ -167,8 +189,10 @@ def inform_changed_data(
         instances = (instances,)
 
     root_instances = set(instance.get_root_rest_element() for instance in instances)
-    elements = [
-        AutoupdateElement(
+
+    elements = []
+    for root_instance in root_instances:
+        element = AutoupdateElement(
             id=root_instance.get_rest_pk(),
             collection_string=root_instance.get_collection_string(),
             disable_history=disable_history,
@@ -176,8 +200,9 @@ def inform_changed_data(
             user_id=user_id,
             no_delete_on_restriction=no_delete_on_restriction,
         )
-        for root_instance in root_instances
-    ]
+        if final_data:
+            element["full_data"] = root_instance.get_full_data()
+        elements.append(element)
     inform_elements(elements)
 
 
@@ -246,14 +271,68 @@ class AutoupdateBundleMiddleware:
         thread_id = threading.get_ident()
         autoupdate_bundle[thread_id] = AutoupdateBundle()
 
+        timing = Timing("request")
+
         response = self.get_response(request)
 
+        timing()
+
+        # rewrite the response by adding the autoupdate on any success-case (2xx status)
         bundle: AutoupdateBundle = autoupdate_bundle.pop(thread_id)
-        bundle.done()
+        if response.status_code >= 200 and response.status_code < 300:
+            change_id = bundle.done()
+
+            if change_id is not None:
+                user_id = request.user.pk or 0
+                # Inject the autoupdate in the response.
+                # The complete response body will be overwritten!
+                autoupdate = async_to_sync(get_autoupdate_data)(
+                    change_id, change_id, user_id
+                )
+                content = {"autoupdate": autoupdate, "data": response.data}
+                # Note: autoupdate may be none on skipped ones (which should not happen
+                # since the user has made the request....)
+                response.content = json.dumps(content)
+
+        timing(True)
         return response
 
 
-def save_history(elements: Iterable[AutoupdateElement]) -> Iterable:
+async def get_autoupdate_data(
+    from_change_id: int, to_change_id: int, user_id: int
+) -> Optional[AutoupdateFormat]:
+    try:
+        changed_elements, deleted_element_ids = await element_cache.get_data_since(
+            user_id, from_change_id, to_change_id
+        )
+    except ChangeIdTooLowError:
+        # The change_id is lower the the lowerst change_id in redis. Return all data
+        changed_elements = await element_cache.get_all_data_list(user_id)
+        all_data = True
+        deleted_elements: Dict[str, List[int]] = {}
+    else:
+        all_data = False
+        deleted_elements = defaultdict(list)
+        for element_id in deleted_element_ids:
+            collection_string, id = split_element_id(element_id)
+            deleted_elements[collection_string].append(id)
+
+    # Check, if the autoupdate has any data.
+    if not changed_elements and not deleted_element_ids:
+        # Skip empty updates
+        return None
+    else:
+        # Normal autoupdate with data
+        return AutoupdateFormat(
+            changed=changed_elements,
+            deleted=deleted_elements,
+            from_change_id=from_change_id,
+            to_change_id=to_change_id,
+            all_data=all_data,
+        )
+
+
+def save_history(element_iterator: Iterable[AutoupdateElement]) -> Iterable:
     """
     Thin wrapper around the call of history saving manager method.
 
@@ -261,4 +340,4 @@ def save_history(elements: Iterable[AutoupdateElement]) -> Iterable:
     """
     from ..core.models import History
 
-    return History.objects.add_elements(elements)
+    return History.objects.add_elements(element_iterator)
diff --git a/openslides/utils/cache.py b/openslides/utils/cache.py
index 00054ca74..14dec14d2 100644
--- a/openslides/utils/cache.py
+++ b/openslides/utils/cache.py
@@ -254,25 +254,6 @@ class ElementCache:
                 all_data[collection] = await restricter(user_id, all_data[collection])
         return dict(all_data)
 
-    async def get_all_data_dict(self) -> Dict[str, Dict[int, Dict[str, Any]]]:
-        """
-        Returns all data with a dict (id <-> element) per collection:
-        {
-            <collection>: {
-                <id>: <element>
-            }
-        }
-        """
-        all_data: Dict[str, Dict[int, Dict[str, Any]]] = defaultdict(dict)
-        for element_id, data in (await self.cache_provider.get_all_data()).items():
-            collection, id = split_element_id(element_id)
-            element = json.loads(data.decode())
-            element.pop(
-                "_no_delete_on_restriction", False
-            )  # remove special field for get_data_since
-            all_data[collection][id] = element
-        return dict(all_data)
-
     async def get_collection_data(self, collection: str) -> Dict[int, Dict[str, Any]]:
         """
         Returns the data for one collection as dict: {id: <element>}
diff --git a/openslides/utils/cache_providers.py b/openslides/utils/cache_providers.py
index 0b5c1ba86..987904424 100644
--- a/openslides/utils/cache_providers.py
+++ b/openslides/utils/cache_providers.py
@@ -8,7 +8,11 @@ from django.core.exceptions import ImproperlyConfigured
 from typing_extensions import Protocol
 
 from . import logging
-from .redis import read_only_redis_amount_replicas, use_redis
+from .redis import (
+    read_only_redis_amount_replicas,
+    read_only_redis_wait_timeout,
+    use_redis,
+)
 from .schema_version import SchemaVersion
 from .utils import split_element_id, str_dict_to_bytes
 
@@ -297,7 +301,7 @@ class RedisCacheProvider:
 
     async def add_to_full_data(self, data: Dict[str, str]) -> None:
         async with get_connection() as redis:
-            redis.hmset_dict(self.full_data_cache_key, data)
+            await redis.hmset_dict(self.full_data_cache_key, data)
 
     async def data_exists(self) -> bool:
         """
@@ -492,11 +496,12 @@ class RedisCacheProvider:
                     raise e
             if not read_only and read_only_redis_amount_replicas is not None:
                 reported_amount = await redis.wait(
-                    read_only_redis_amount_replicas, 1000
+                    read_only_redis_amount_replicas, read_only_redis_wait_timeout
                 )
                 if reported_amount != read_only_redis_amount_replicas:
                     logger.warn(
-                        f"WAIT reported {reported_amount} replicas of {read_only_redis_amount_replicas} requested!"
+                        f"WAIT reported {reported_amount} replicas of {read_only_redis_amount_replicas} "
+                        + f"requested after {read_only_redis_wait_timeout} ms!"
                     )
             return result
 
diff --git a/openslides/utils/consumer_autoupdate_strategy.py b/openslides/utils/consumer_autoupdate_strategy.py
new file mode 100644
index 000000000..f5a03cb29
--- /dev/null
+++ b/openslides/utils/consumer_autoupdate_strategy.py
@@ -0,0 +1,108 @@
+import asyncio
+from asyncio import Task
+from typing import Optional, cast
+
+from django.conf import settings
+
+from .autoupdate import get_autoupdate_data
+from .cache import element_cache
+from .websocket import ChangeIdTooHighException, ProtocollAsyncJsonWebsocketConsumer
+
+
+AUTOUPDATE_DELAY = getattr(settings, "AUTOUPDATE_DELAY", None)
+
+
+class ConsumerAutoupdateStrategy:
+    def __init__(self, consumer: ProtocollAsyncJsonWebsocketConsumer) -> None:
+        self.consumer = consumer
+        # client_change_id = None: unknown -> set on first autoupdate or request_change_id
+        # client_change_id is int: the change_id, the client knows about, so the next
+        # update must be from client_change_id+1 .. <next clange_id>
+        self.client_change_id: Optional[int] = None
+        self.max_seen_change_id = 0
+        self.next_send_time = None
+        self.timer_task_handle: Optional[Task[None]] = None
+        self.lock = asyncio.Lock()
+
+    async def request_change_id(
+        self, change_id: int, in_response: Optional[str] = None
+    ) -> None:
+        """
+        The change id is not inclusive, so the client is on change_id and wants
+        data from change_id+1 .. now
+        """
+        # This resets the server side tracking of the client's change id.
+        async with self.lock:
+            await self.stop_timer()
+
+            self.max_seen_change_id = await element_cache.get_current_change_id()
+            print(self.max_seen_change_id)
+            self.client_change_id = change_id
+
+            if self.client_change_id == self.max_seen_change_id:
+                # The client is up-to-date, so nothing will be done
+                return None
+
+            if self.client_change_id > self.max_seen_change_id:
+                message = (
+                    f"Requested change_id {self.client_change_id} is higher than the "
+                    + f"highest change_id {self.max_seen_change_id}."
+                )
+                raise ChangeIdTooHighException(message, in_response=in_response)
+
+            await self.send_autoupdate(in_response=in_response)
+
+    async def new_change_id(self, change_id: int) -> None:
+        async with self.lock:
+            if self.client_change_id is None:
+                # The -1 is to send this autoupdate as the first one to he client.
+                # Remember: the client_change_id is the change_id the client knows about
+                self.client_change_id = change_id - 1
+            if change_id > self.max_seen_change_id:
+                self.max_seen_change_id = change_id
+
+            if AUTOUPDATE_DELAY is None:  # feature deactivated, send directly
+                await self.send_autoupdate()
+            elif self.timer_task_handle is None:
+                await self.start_timer()
+
+    async def get_running_loop(self) -> asyncio.AbstractEventLoop:
+        if hasattr(asyncio, "get_running_loop"):
+            return asyncio.get_running_loop()  # type: ignore
+        else:
+            return asyncio.get_event_loop()
+
+    async def start_timer(self) -> None:
+        loop = await self.get_running_loop()
+        self.timer_task_handle = loop.create_task(self.timer_task())
+
+    async def stop_timer(self) -> None:
+        if self.timer_task_handle is not None:
+            self.timer_task_handle.cancel()
+        self.timer_task_handle = None
+
+    async def timer_task(self) -> None:
+        try:
+            await asyncio.sleep(AUTOUPDATE_DELAY)
+        except asyncio.CancelledError:
+            return
+
+        async with self.lock:
+            await self.send_autoupdate()
+            self.timer_task_handle = None
+
+    async def send_autoupdate(self, in_response: Optional[str] = None) -> None:
+        # it is important to save this variable, because it can change during runtime.
+        max_change_id = self.max_seen_change_id
+        # here, 1 is added to the change_id, because the client_change_id is the id the client
+        # *knows* about -> the client needs client_change_id+1 since get_autoupdate_data is
+        # inclusive [change_id .. max_change_id].
+        autoupdate = await get_autoupdate_data(
+            cast(int, self.client_change_id) + 1, max_change_id, self.consumer.user_id
+        )
+        if autoupdate is not None:
+            # It will be send, so we can set the client_change_id
+            self.client_change_id = max_change_id
+            await self.consumer.send_json(
+                type="autoupdate", content=autoupdate, in_response=in_response,
+            )
diff --git a/openslides/utils/consumers.py b/openslides/utils/consumers.py
index 1073f831d..7432423f9 100644
--- a/openslides/utils/consumers.py
+++ b/openslides/utils/consumers.py
@@ -1,32 +1,19 @@
 import time
-from collections import defaultdict
 from typing import Any, Dict, List, Optional, cast
 from urllib.parse import parse_qs
 
 from channels.generic.websocket import AsyncWebsocketConsumer
-from mypy_extensions import TypedDict
 
-from ..utils.websocket import WEBSOCKET_CHANGE_ID_TOO_HIGH
 from . import logging
 from .auth import UserDoesNotExist, async_anonymous_is_enabled
-from .cache import ChangeIdTooLowError, element_cache, split_element_id
+from .cache import element_cache
+from .consumer_autoupdate_strategy import ConsumerAutoupdateStrategy
 from .utils import get_worker_id
-from .websocket import ProtocollAsyncJsonWebsocketConsumer
+from .websocket import BaseWebsocketException, ProtocollAsyncJsonWebsocketConsumer
 
 
 logger = logging.getLogger("openslides.websocket")
 
-AutoupdateFormat = TypedDict(
-    "AutoupdateFormat",
-    {
-        "changed": Dict[str, List[Dict[str, Any]]],
-        "deleted": Dict[str, List[int]],
-        "from_change_id": int,
-        "to_change_id": int,
-        "all_data": bool,
-    },
-)
-
 
 class SiteConsumer(ProtocollAsyncJsonWebsocketConsumer):
     """
@@ -40,12 +27,11 @@ class SiteConsumer(ProtocollAsyncJsonWebsocketConsumer):
     ID counter for assigning each instance of this class an unique id.
     """
 
-    skipped_autoupdate_from_change_id: Optional[int] = None
-
     def __init__(self, *args: Any, **kwargs: Any) -> None:
         self.projector_hash: Dict[int, int] = {}
         SiteConsumer.ID_COUNTER += 1
         self._id = get_worker_id() + "-" + str(SiteConsumer.ID_COUNTER)
+        self.autoupdate_strategy = ConsumerAutoupdateStrategy(self)
         super().__init__(*args, **kwargs)
 
     async def connect(self) -> None:
@@ -56,11 +42,13 @@ class SiteConsumer(ProtocollAsyncJsonWebsocketConsumer):
 
         Sends the startup data to the user.
         """
+        self.user_id = self.scope["user"]["id"]
+
         self.connect_time = time.time()
         # self.scope['user'] is the full_data dict of the user. For an
         # anonymous user is it the dict {'id': 0}
         change_id = None
-        if not await async_anonymous_is_enabled() and not self.scope["user"]["id"]:
+        if not await async_anonymous_is_enabled() and not self.user_id:
             await self.accept()  # workaround for #4009
             await self.close()
             logger.debug(f"connect: denied ({self._id})")
@@ -74,24 +62,23 @@ class SiteConsumer(ProtocollAsyncJsonWebsocketConsumer):
                 change_id = int(query_string[b"change_id"][0])
             except ValueError:
                 await self.accept()  # workaround for #4009
-                await self.close()  # TODO: Find a way to send an error code
+                await self.close()
                 logger.debug(f"connect: wrong change id ({self._id})")
                 return
 
-        if b"autoupdate" in query_string and query_string[b"autoupdate"][
-            0
-        ].lower() not in [b"0", b"off", b"false"]:
-            # a positive value in autoupdate. Start autoupdate
-            await self.channel_layer.group_add("autoupdate", self.channel_name)
-
         await self.accept()
 
         if change_id is not None:
             logger.debug(f"connect: change id {change_id} ({self._id})")
-            await self.send_autoupdate(change_id)
+            try:
+                await self.request_autoupdate(change_id)
+            except BaseWebsocketException as e:
+                await self.send_exception(e)
         else:
             logger.debug(f"connect: no change id ({self._id})")
 
+        await self.channel_layer.group_add("autoupdate", self.channel_name)
+
     async def disconnect(self, close_code: int) -> None:
         """
         A user disconnects. Remove it from autoupdate.
@@ -102,110 +89,19 @@ class SiteConsumer(ProtocollAsyncJsonWebsocketConsumer):
             f"disconnect code={close_code} active_secs={active_seconds} ({self._id})"
         )
 
-    async def send_notify(self, event: Dict[str, Any]) -> None:
-        """
-        Send a notify message to the user.
-        """
-        user_id = self.scope["user"]["id"]
-        item = event["incomming"]
-
-        users = item.get("users")
-        reply_channels = item.get("replyChannels")
-        if (
-            (isinstance(users, bool) and users)
-            or (isinstance(users, list) and user_id in users)
-            or (
-                isinstance(reply_channels, list) and self.channel_name in reply_channels
-            )
-            or (users is None and reply_channels is None)
-        ):
-            item["senderChannelName"] = event["senderChannelName"]
-            item["senderUserId"] = event["senderUserId"]
-            await self.send_json(type="notify", content=item)
-
-    async def send_autoupdate(
-        self,
-        change_id: int,
-        max_change_id: Optional[int] = None,
-        in_response: Optional[str] = None,
-    ) -> None:
-        """
-        Sends an autoupdate to the client from change_id to max_change_id.
-        If max_change_id is None, the current change id will be used.
-        """
-        user_id = self.scope["user"]["id"]
-
-        if max_change_id is None:
-            max_change_id = await element_cache.get_current_change_id()
-
-        if change_id == max_change_id + 1:
-            # The client is up-to-date, so nothing will be done
-            return
-
-        if change_id > max_change_id:
-            message = f"Requested change_id {change_id} is higher this highest change_id {max_change_id}."
-            await self.send_error(
-                code=WEBSOCKET_CHANGE_ID_TOO_HIGH,
-                message=message,
-                in_response=in_response,
-            )
-            return
-
-        try:
-            changed_elements, deleted_element_ids = await element_cache.get_data_since(
-                user_id, change_id, max_change_id
-            )
-        except ChangeIdTooLowError:
-            # The change_id is lower the the lowerst change_id in redis. Return all data
-            changed_elements = await element_cache.get_all_data_list(user_id)
-            all_data = True
-            deleted_elements: Dict[str, List[int]] = {}
-        except UserDoesNotExist:
-            # Maybe the user was deleted, but a websocket connection is still open to the user.
-            # So we can close this connection and return.
-            await self.close()
-            return
-        else:
-            all_data = False
-            deleted_elements = defaultdict(list)
-            for element_id in deleted_element_ids:
-                collection_string, id = split_element_id(element_id)
-                deleted_elements[collection_string].append(id)
-
-        # Check, if the autoupdate has any data.
-        if not changed_elements and not deleted_element_ids:
-            # Set the current from_change_id, if it is the first skipped autoupdate
-            if not self.skipped_autoupdate_from_change_id:
-                self.skipped_autoupdate_from_change_id = change_id
-        else:
-            # Normal autoupdate with data
-            from_change_id = change_id
-
-            # If there is at least one skipped autoupdate, take the saved from_change_id
-            if self.skipped_autoupdate_from_change_id:
-                from_change_id = self.skipped_autoupdate_from_change_id
-                self.skipped_autoupdate_from_change_id = None
-
-            await self.send_json(
-                type="autoupdate",
-                content=AutoupdateFormat(
-                    changed=changed_elements,
-                    deleted=deleted_elements,
-                    from_change_id=from_change_id,
-                    to_change_id=max_change_id,
-                    all_data=all_data,
-                ),
-                in_response=in_response,
-            )
-
-    async def send_data(self, event: Dict[str, Any]) -> None:
+    async def msg_new_change_id(self, event: Dict[str, Any]) -> None:
         """
         Send changed or deleted elements to the user.
         """
         change_id = event["change_id"]
-        await self.send_autoupdate(change_id, max_change_id=change_id)
+        try:
+            await self.autoupdate_strategy.new_change_id(change_id)
+        except UserDoesNotExist:
+            # Maybe the user was deleted, but a websocket connection is still open to the user.
+            # So we can close this connection and return.
+            await self.close()
 
-    async def projector_changed(self, event: Dict[str, Any]) -> None:
+    async def msg_projector_data(self, event: Dict[str, Any]) -> None:
         """
         The projector has changed.
         """
@@ -223,6 +119,33 @@ class SiteConsumer(ProtocollAsyncJsonWebsocketConsumer):
         if projector_data:
             await self.send_projector_data(projector_data, change_id=change_id)
 
+    async def msg_notify(self, event: Dict[str, Any]) -> None:
+        """
+        Send a notify message to the user.
+        """
+        item = event["incomming"]
+
+        users = item.get("users")
+        reply_channels = item.get("replyChannels")
+        if (
+            (isinstance(users, bool) and users)
+            or (isinstance(users, list) and self.user_id in users)
+            or (
+                isinstance(reply_channels, list) and self.channel_name in reply_channels
+            )
+            or (users is None and reply_channels is None)
+        ):
+            item["senderChannelName"] = event["senderChannelName"]
+            item["senderUserId"] = event["senderUserId"]
+            await self.send_json(type="notify", content=item)
+
+    async def request_autoupdate(
+        self, change_id: int, in_response: Optional[str] = None
+    ) -> None:
+        await self.autoupdate_strategy.request_change_id(
+            change_id, in_response=in_response
+        )
+
     async def send_projector_data(
         self,
         data: Dict[int, Dict[str, Any]],
diff --git a/openslides/utils/models.py b/openslides/utils/models.py
index 8a531ac17..91a43107c 100644
--- a/openslides/utils/models.py
+++ b/openslides/utils/models.py
@@ -175,7 +175,7 @@ class RESTModelMixin:
                 current_time = time.time()
                 if current_time > last_time + 5:
                     last_time = current_time
-                    logger.info(f"\t{i+1}/{instances_length}...")
+                    logger.info(f"    {i+1}/{instances_length}...")
         return full_data
 
     @classmethod
diff --git a/openslides/utils/projector.py b/openslides/utils/projector.py
index 9e20fddcd..3a8f1cc00 100644
--- a/openslides/utils/projector.py
+++ b/openslides/utils/projector.py
@@ -5,16 +5,14 @@ Functions  that handel the registration of projector elements and the rendering
 of the data to present it on the projector.
 """
 
-from typing import Any, Awaitable, Callable, Dict, List
+from collections import defaultdict
+from typing import Any, Awaitable, Callable, Dict, List, Optional
 
+from . import logging
 from .cache import element_cache
 
 
-AllData = Dict[str, Dict[int, Dict[str, Any]]]
-ProjectorSlide = Callable[[AllData, Dict[str, Any], int], Awaitable[Dict[str, Any]]]
-
-
-projector_slides: Dict[str, ProjectorSlide] = {}
+logger = logging.getLogger(__name__)
 
 
 class ProjectorElementException(Exception):
@@ -23,6 +21,46 @@ class ProjectorElementException(Exception):
     """
 
 
+class ProjectorAllDataProvider:
+    NON_EXISTENT_MARKER = object()
+
+    def __init__(self) -> None:
+        self.cache: Any = defaultdict(dict)  # fuu you mypy
+        self.fetched_collection: Dict[str, bool] = {}
+
+    async def get(self, collection: str, id: int) -> Optional[Dict[str, Any]]:
+        cache_data = self.cache[collection].get(id)
+        if cache_data is None:
+            data: Any = await element_cache.get_element_data(collection, id)
+            if data is None:
+                data = ProjectorAllDataProvider.NON_EXISTENT_MARKER
+            self.cache[collection][id] = data
+
+        cache_data = self.cache[collection][id]
+        if cache_data == ProjectorAllDataProvider.NON_EXISTENT_MARKER:
+            return None
+        return cache_data
+
+    async def get_collection(self, collection: str) -> Dict[int, Dict[str, Any]]:
+        if not self.fetched_collection.get(collection, False):
+            collection_data = await element_cache.get_collection_data(collection)
+            self.cache[collection] = collection_data
+            self.fetched_collection[collection] = True
+        return self.cache[collection]
+
+    async def exists(self, collection: str, id: int) -> bool:
+        model = await self.get(collection, id)
+        return model is not None
+
+
+ProjectorSlide = Callable[
+    [ProjectorAllDataProvider, Dict[str, Any], int], Awaitable[Dict[str, Any]]
+]
+
+
+projector_slides: Dict[str, ProjectorSlide] = {}
+
+
 def register_projector_slide(name: str, slide: ProjectorSlide) -> None:
     """
     Registers a projector slide.
@@ -67,10 +105,11 @@ async def get_projector_data(
     if projector_ids is None:
         projector_ids = []
 
-    all_data = await element_cache.get_all_data_dict()
     projector_data: Dict[int, List[Dict[str, Any]]] = {}
+    all_data_provider = ProjectorAllDataProvider()
+    projectors = await all_data_provider.get_collection("core/projector")
 
-    for projector_id, projector in all_data.get("core/projector", {}).items():
+    for projector_id, projector in projectors.items():
         if projector_ids and projector_id not in projector_ids:
             # only render the projector in question.
             continue
@@ -83,7 +122,7 @@ async def get_projector_data(
         for element in projector["elements"]:
             projector_slide = projector_slides[element["name"]]
             try:
-                data = await projector_slide(all_data, element, projector_id)
+                data = await projector_slide(all_data_provider, element, projector_id)
             except ProjectorElementException as err:
                 data = {"error": str(err)}
             projector_data[projector_id].append({"data": data, "element": element})
@@ -91,18 +130,23 @@ async def get_projector_data(
     return projector_data
 
 
-async def get_config(all_data: AllData, key: str) -> Any:
+async def get_config(all_data_provider: ProjectorAllDataProvider, key: str) -> Any:
     """
-    Returns a config value from all_data.
+    Returns a config value from all_data_provider.
+    Triggers the cache early: It access `get_colelction` instead of `get`. It
+    allows for all successive queries for configs to be cached.
     """
     from ..core.config import config
 
     config_id = (await config.async_get_key_to_id())[key]
 
-    return all_data[config.get_collection_string()][config_id]["value"]
+    configs = await all_data_provider.get_collection(config.get_collection_string())
+    return configs[config_id]["value"]
 
 
-def get_model(all_data: AllData, collection: str, id: Any) -> Dict[str, Any]:
+async def get_model(
+    all_data_provider: ProjectorAllDataProvider, collection: str, id: Any
+) -> Dict[str, Any]:
     """
     Tries to get the model identified by the collection and id.
     If the id is invalid or the model not found, ProjectorElementExceptions will be raised.
@@ -110,17 +154,19 @@ def get_model(all_data: AllData, collection: str, id: Any) -> Dict[str, Any]:
     if id is None:
         raise ProjectorElementException(f"id is required for {collection} slide")
 
-    try:
-        model = all_data[collection][id]
-    except KeyError:
+    model = await all_data_provider.get(collection, id)
+    if model is None:
         raise ProjectorElementException(f"{collection} with id {id} does not exist")
     return model
 
 
-def get_models(
-    all_data: AllData, collection: str, ids: List[Any]
+async def get_models(
+    all_data_provider: ProjectorAllDataProvider, collection: str, ids: List[Any]
 ) -> List[Dict[str, Any]]:
     """
     Tries to fetch all given models. Models are required to be all of the collection `collection`.
     """
-    return [get_model(all_data, collection, id) for id in ids]
+    logger.info(
+        f"Note: a call to `get_models` with {collection}/{ids}. This might be cache-intensive"
+    )
+    return [await get_model(all_data_provider, collection, id) for id in ids]
diff --git a/openslides/utils/redis.py b/openslides/utils/redis.py
index acc370f54..d5ff24065 100644
--- a/openslides/utils/redis.py
+++ b/openslides/utils/redis.py
@@ -11,6 +11,7 @@ logger = logging.getLogger(__name__)
 use_redis = False
 use_read_only_redis = False
 read_only_redis_amount_replicas = None
+read_only_redis_wait_timeout = None
 
 try:
     import aioredis
@@ -35,6 +36,8 @@ else:
 
             read_only_redis_amount_replicas = getattr(settings, "AMOUNT_REPLICAS", 1)
             logger.info(f"AMOUNT_REPLICAS={read_only_redis_amount_replicas}")
+            read_only_redis_wait_timeout = getattr(settings, "WAIT_TIMEOUT", 1000)
+            logger.info(f"WAIT_TIMEOUT={read_only_redis_wait_timeout}")
     else:
         logger.info("Redis is not configured.")
 
diff --git a/openslides/utils/timing.py b/openslides/utils/timing.py
new file mode 100644
index 000000000..ebcc2f35c
--- /dev/null
+++ b/openslides/utils/timing.py
@@ -0,0 +1,27 @@
+import time
+from typing import List, Optional
+
+from . import logging
+
+
+timelogger = logging.getLogger(__name__)
+
+
+class Timing:
+    def __init__(self, name: str) -> None:
+        self.name = name
+        self.times: List[float] = [time.time()]
+
+    def __call__(self, done: Optional[bool] = False) -> None:
+        self.times.append(time.time())
+        if done:
+            self.printtime()
+
+    def printtime(self) -> None:
+        s = f"{self.name}: "
+        for i in range(1, len(self.times)):
+            diff = self.times[i] - self.times[i - 1]
+            s += f"{i}: {diff:.5f} "
+        diff = self.times[-1] - self.times[0]
+        s += f"sum: {diff:.5f}"
+        timelogger.info(s)
diff --git a/openslides/utils/websocket.py b/openslides/utils/websocket.py
index b001b2dc9..42e5b802f 100644
--- a/openslides/utils/websocket.py
+++ b/openslides/utils/websocket.py
@@ -25,6 +25,26 @@ WEBSOCKET_WRONG_FORMAT = 102
 # If the recieved data has not the expected format.
 
 
+class BaseWebsocketException(Exception):
+    code: int
+
+    def __init__(self, message: str, in_response: Optional[str] = None) -> None:
+        self.message = message
+        self.in_response = in_response
+
+
+class NotAuthorizedException(BaseWebsocketException):
+    code = WEBSOCKET_NOT_AUTHORIZED
+
+
+class ChangeIdTooHighException(BaseWebsocketException):
+    code = WEBSOCKET_CHANGE_ID_TOO_HIGH
+
+
+class WrongFormatException(BaseWebsocketException):
+    code = WEBSOCKET_WRONG_FORMAT
+
+
 class AsyncCompressedJsonWebsocketConsumer(AsyncWebsocketConsumer):
     async def receive(
         self,
@@ -122,6 +142,20 @@ class ProtocollAsyncJsonWebsocketConsumer(AsyncCompressedJsonWebsocketConsumer):
             silence_errors=silence_errors,
         )
 
+    async def send_exception(
+        self, e: BaseWebsocketException, silence_errors: Optional[bool] = True,
+    ) -> None:
+        """
+        Send generic error messages with a custom status code (see above) and a text message.
+        """
+        await self.send_json(
+            "error",
+            {"code": e.code, "message": e.message},
+            None,
+            in_response=e.in_response,
+            silence_errors=silence_errors,
+        )
+
     async def receive_json(self, content: Any) -> None:  # type: ignore
         """
         Receives the json data, parses it and calls receive_content.
@@ -140,9 +174,12 @@ class ProtocollAsyncJsonWebsocketConsumer(AsyncCompressedJsonWebsocketConsumer):
             )
             return
 
-        await websocket_client_messages[content["type"]].receive_content(
-            self, content["content"], id=content["id"]
-        )
+        try:
+            await websocket_client_messages[content["type"]].receive_content(
+                self, content["content"], id=content["id"]
+            )
+        except BaseWebsocketException as e:
+            await self.send_exception(e)
 
 
 schema: Dict[str, Any] = {
diff --git a/openslides/core/websocket.py b/openslides/utils/websocket_client_messages.py
similarity index 79%
rename from openslides/core/websocket.py
rename to openslides/utils/websocket_client_messages.py
index a43447305..d66eb1f58 100644
--- a/openslides/core/websocket.py
+++ b/openslides/utils/websocket_client_messages.py
@@ -1,21 +1,22 @@
 from typing import Any, Dict, Optional
 
-from ..utils import logging
-from ..utils.auth import async_has_perm
-from ..utils.constants import get_constants
-from ..utils.projector import get_projector_data
-from ..utils.stats import WebsocketLatencyLogger
-from ..utils.websocket import (
-    WEBSOCKET_NOT_AUTHORIZED,
+from . import logging
+from .auth import async_has_perm
+from .constants import get_constants
+from .projector import get_projector_data
+from .stats import WebsocketLatencyLogger
+from .websocket import (
     BaseWebsocketClientMessage,
+    NotAuthorizedException,
     ProtocollAsyncJsonWebsocketConsumer,
+    register_client_message,
 )
 
 
 logger = logging.getLogger(__name__)
 
 
-class NotifyWebsocketClientMessage(BaseWebsocketClientMessage):
+class Notify(BaseWebsocketClientMessage):
     """
     Websocket message from a client to send a message to other clients.
     """
@@ -59,13 +60,9 @@ class NotifyWebsocketClientMessage(BaseWebsocketClientMessage):
     ) -> None:
         # Check if the user is allowed to send this notify message
         perm = self.notify_permissions.get(content["name"])
-        if perm is not None and not await async_has_perm(
-            consumer.scope["user"]["id"], perm
-        ):
-            await consumer.send_error(
-                code=WEBSOCKET_NOT_AUTHORIZED,
-                message=f"You need '{perm}' to send this message.",
-                in_response=id,
+        if perm is not None and not await async_has_perm(consumer.user_id, perm):
+            raise NotAuthorizedException(
+                f"You need '{perm}' to send this message.", in_response=id,
             )
         else:
             # Some logging
@@ -84,15 +81,18 @@ class NotifyWebsocketClientMessage(BaseWebsocketClientMessage):
             await consumer.channel_layer.group_send(
                 "site",
                 {
-                    "type": "send_notify",
+                    "type": "msg_notify",
                     "incomming": content,
                     "senderChannelName": consumer.channel_name,
-                    "senderUserId": consumer.scope["user"]["id"],
+                    "senderUserId": consumer.user_id,
                 },
             )
 
 
-class ConstantsWebsocketClientMessage(BaseWebsocketClientMessage):
+register_client_message(Notify())
+
+
+class Constants(BaseWebsocketClientMessage):
     """
     The Client requests the constants.
     """
@@ -109,7 +109,10 @@ class ConstantsWebsocketClientMessage(BaseWebsocketClientMessage):
         )
 
 
-class GetElementsWebsocketClientMessage(BaseWebsocketClientMessage):
+register_client_message(Constants())
+
+
+class GetElements(BaseWebsocketClientMessage):
     """
     The Client request database elements.
     """
@@ -130,26 +133,10 @@ class GetElementsWebsocketClientMessage(BaseWebsocketClientMessage):
         self, consumer: "ProtocollAsyncJsonWebsocketConsumer", content: Any, id: str
     ) -> None:
         requested_change_id = content.get("change_id", 0)
-        await consumer.send_autoupdate(requested_change_id, in_response=id)
+        await consumer.request_autoupdate(requested_change_id, in_response=id)
 
 
-class AutoupdateWebsocketClientMessage(BaseWebsocketClientMessage):
-    """
-    The Client turns autoupdate on or off.
-    """
-
-    identifier = "autoupdate"
-
-    async def receive_content(
-        self, consumer: "ProtocollAsyncJsonWebsocketConsumer", content: Any, id: str
-    ) -> None:
-        # Turn on or off the autoupdate for the client
-        if content:  # accept any value, that can be interpreted as bool
-            await consumer.channel_layer.group_add("autoupdate", consumer.channel_name)
-        else:
-            await consumer.channel_layer.group_discard(
-                "autoupdate", consumer.channel_name
-            )
+register_client_message(GetElements())
 
 
 class ListenToProjectors(BaseWebsocketClientMessage):
@@ -198,6 +185,9 @@ class ListenToProjectors(BaseWebsocketClientMessage):
             await consumer.send_projector_data(projector_data, in_response=id)
 
 
+register_client_message(ListenToProjectors())
+
+
 class PingPong(BaseWebsocketClientMessage):
     """
     Responds to pings from the client.
@@ -220,3 +210,6 @@ class PingPong(BaseWebsocketClientMessage):
         await consumer.send_json(type="pong", content=latency, in_response=id)
         if latency is not None:
             await WebsocketLatencyLogger.add_latency(latency)
+
+
+register_client_message(PingPong())
diff --git a/tests/integration/helpers.py b/tests/integration/helpers.py
index f83011d6e..2791e70be 100644
--- a/tests/integration/helpers.py
+++ b/tests/integration/helpers.py
@@ -1,9 +1,13 @@
-from typing import Any, Dict, List
+from typing import Any, Dict, List, Optional, cast
 
 from openslides.core.config import config
 from openslides.core.models import Projector
 from openslides.users.models import User
-from openslides.utils.projector import AllData, get_config, register_projector_slide
+from openslides.utils.projector import (
+    ProjectorAllDataProvider,
+    get_config,
+    register_projector_slide,
+)
 
 
 class TConfig:
@@ -94,19 +98,23 @@ class TProjector:
 
 
 async def slide1(
-    all_data: AllData, element: Dict[str, Any], projector_id: int
+    all_data_provider: ProjectorAllDataProvider,
+    element: Dict[str, Any],
+    projector_id: int,
 ) -> Dict[str, Any]:
     """
     Slide that shows the general_event_name.
     """
     return {
         "name": "slide1",
-        "event_name": await get_config(all_data, "general_event_name"),
+        "event_name": await get_config(all_data_provider, "general_event_name"),
     }
 
 
 async def slide2(
-    all_data: AllData, element: Dict[str, Any], projector_id: int
+    all_data_provider: ProjectorAllDataProvider,
+    element: Dict[str, Any],
+    projector_id: int,
 ) -> Dict[str, Any]:
     return {"name": "slide2"}
 
@@ -115,17 +123,26 @@ register_projector_slide("test/slide1", slide1)
 register_projector_slide("test/slide2", slide2)
 
 
-def all_data_config() -> AllData:
-    return {
-        TConfig().get_collection_string(): {
-            element["id"]: element for element in TConfig().get_elements()
-        }
-    }
+class TestProjectorAllDataProvider:
+    def __init__(self, data):
+        self.data = data
+
+    async def get(self, collection: str, id: int) -> Optional[Dict[str, Any]]:
+        collection_data = await self.get_collection(collection)
+        return collection_data.get(id)
+
+    async def get_collection(self, collection: str) -> Dict[int, Dict[str, Any]]:
+        return self.data.get(collection, {})
+
+    async def exists(self, collection: str, id: int) -> bool:
+        return (await self.get(collection, id)) is not None
 
 
-def all_data_users() -> AllData:
-    return {
-        TUser().get_collection_string(): {
-            element["id"]: element for element in TUser().get_elements()
-        }
+def get_all_data_provider(data) -> ProjectorAllDataProvider:
+    data[TConfig().get_collection_string()] = {
+        element["id"]: element for element in TConfig().get_elements()
     }
+    data[TUser().get_collection_string()] = {
+        element["id"]: element for element in TUser().get_elements()
+    }
+    return cast(ProjectorAllDataProvider, TestProjectorAllDataProvider(data))
diff --git a/tests/integration/utils/test_consumers.py b/tests/integration/utils/test_consumers.py
index 80bf93729..764bb143e 100644
--- a/tests/integration/utils/test_consumers.py
+++ b/tests/integration/utils/test_consumers.py
@@ -1,4 +1,3 @@
-import asyncio
 from importlib import import_module
 from typing import Optional, Tuple
 from unittest.mock import patch
@@ -51,7 +50,7 @@ async def prepare_element_cache(settings):
         ]
     )
     element_cache._cachables = None
-    await element_cache.async_ensure_cache(default_change_id=2)
+    await element_cache.async_ensure_cache(default_change_id=10)
     yield
     # Reset the cachable_provider
     element_cache.cachable_provider = orig_cachable_provider
@@ -158,19 +157,9 @@ async def test_connection_with_too_big_change_id(get_communicator, set_config):
 
 
 @pytest.mark.asyncio
-async def test_changed_data_autoupdate_off(communicator, set_config):
+async def test_changed_data_autoupdate(get_communicator, set_config):
     await set_config("general_system_enable_anonymous", True)
-    await communicator.connect()
-
-    # Change a config value
-    await set_config("general_event_name", "Test Event")
-    assert await communicator.receive_nothing()
-
-
-@pytest.mark.asyncio
-async def test_changed_data_autoupdate_on(get_communicator, set_config):
-    await set_config("general_system_enable_anonymous", True)
-    communicator = get_communicator("autoupdate=on")
+    communicator = get_communicator()
     await communicator.connect()
 
     # Change a config value
@@ -212,7 +201,7 @@ async def create_user_session_cookie(user_id: int) -> Tuple[bytes, bytes]:
 @pytest.mark.asyncio
 async def test_with_user(get_communicator):
     cookie_header = await create_user_session_cookie(1)
-    communicator = get_communicator("autoupdate=on", headers=[cookie_header])
+    communicator = get_communicator(headers=[cookie_header])
 
     connected, __ = await communicator.connect()
 
@@ -222,7 +211,7 @@ async def test_with_user(get_communicator):
 @pytest.mark.asyncio
 async def test_skipping_autoupdate(set_config, get_communicator):
     cookie_header = await create_user_session_cookie(1)
-    communicator = get_communicator("autoupdate=on", headers=[cookie_header])
+    communicator = get_communicator(headers=[cookie_header])
 
     await communicator.connect()
 
@@ -265,7 +254,7 @@ async def test_skipping_autoupdate(set_config, get_communicator):
 @pytest.mark.asyncio
 async def test_receive_deleted_data(get_communicator, set_config):
     await set_config("general_system_enable_anonymous", True)
-    communicator = get_communicator("autoupdate=on")
+    communicator = get_communicator()
     await communicator.connect()
 
     # Delete test element
@@ -395,6 +384,7 @@ async def test_send_get_elements_too_big_change_id(communicator, set_config):
 
 @pytest.mark.asyncio
 async def test_send_get_elements_too_small_change_id(communicator, set_config):
+    # Note: this test depends on the default_change_id set in prepare_element_cache
     await set_config("general_system_enable_anonymous", True)
     await communicator.connect()
 
@@ -422,12 +412,12 @@ async def test_send_connect_up_to_date(communicator, set_config):
         {"type": "getElements", "content": {"change_id": 0}, "id": "test_id"}
     )
     response1 = await communicator.receive_json_from()
-    first_change_id = response1.get("content")["to_change_id"]
+    max_change_id = response1.get("content")["to_change_id"]
 
     await communicator.send_json_to(
         {
             "type": "getElements",
-            "content": {"change_id": first_change_id + 1},
+            "content": {"change_id": max_change_id},
             "id": "test_id",
         }
     )
@@ -510,43 +500,6 @@ async def test_send_invalid_get_elements(communicator, set_config):
     assert response.get("in_response") == "test_id"
 
 
-@pytest.mark.asyncio
-async def test_turn_on_autoupdate(communicator, set_config):
-    await set_config("general_system_enable_anonymous", True)
-    await communicator.connect()
-
-    await communicator.send_json_to(
-        {"type": "autoupdate", "content": "on", "id": "test_id"}
-    )
-    await asyncio.sleep(0.01)
-    # Change a config value
-    await set_config("general_event_name", "Test Event")
-    response = await communicator.receive_json_from()
-
-    id = config.get_key_to_id()["general_event_name"]
-    type = response.get("type")
-    content = response.get("content")
-    assert type == "autoupdate"
-    assert content["changed"] == {
-        "core/config": [{"id": id, "key": "general_event_name", "value": "Test Event"}]
-    }
-
-
-@pytest.mark.asyncio
-async def test_turn_off_autoupdate(get_communicator, set_config):
-    await set_config("general_system_enable_anonymous", True)
-    communicator = get_communicator("autoupdate=on")
-    await communicator.connect()
-
-    await communicator.send_json_to(
-        {"type": "autoupdate", "content": False, "id": "test_id"}
-    )
-    await asyncio.sleep(0.01)
-    # Change a config value
-    await set_config("general_event_name", "Test Event")
-    assert await communicator.receive_nothing()
-
-
 @pytest.mark.asyncio
 async def test_listen_to_projector(communicator, set_config):
     await set_config("general_system_enable_anonymous", True)
@@ -565,7 +518,7 @@ async def test_listen_to_projector(communicator, set_config):
     content = response.get("content")
     assert type == "projector"
     assert content == {
-        "change_id": 3,
+        "change_id": 11,
         "data": {
             "1": [
                 {
@@ -588,17 +541,22 @@ async def test_update_projector(communicator, set_config):
             "id": "test_id",
         }
     )
-    await communicator.receive_json_from()
+    await communicator.receive_json_from()  # recieve initial projector data
 
     # Change a config value
     await set_config("general_event_name", "Test Event")
+
+    # We need two messages: The autoupdate and the projector data in this order
+    response = await communicator.receive_json_from()
+    assert response.get("type") == "autoupdate"
+
     response = await communicator.receive_json_from()
 
     type = response.get("type")
     content = response.get("content")
     assert type == "projector"
     assert content == {
-        "change_id": 4,
+        "change_id": 12,
         "data": {
             "1": [
                 {
@@ -629,4 +587,8 @@ async def test_update_projector_to_current_value(communicator, set_config):
     # Change a config value to current_value
     await set_config("general_event_name", "OpenSlides")
 
+    # We await an autoupdate, bot no projector data
+    response = await communicator.receive_json_from()
+    assert response.get("type") == "autoupdate"
+
     assert await communicator.receive_nothing()
diff --git a/tests/unit/agenda/test_projector.py b/tests/unit/agenda/test_projector.py
index 0f86a54ca..442be4079 100644
--- a/tests/unit/agenda/test_projector.py
+++ b/tests/unit/agenda/test_projector.py
@@ -4,10 +4,12 @@ import pytest
 
 from openslides.agenda import projector
 
+from ...integration.helpers import get_all_data_provider
+
 
 @pytest.fixture
-def all_data():
-    all_data = {
+def all_data_provider():
+    data = {
         "agenda/item": {
             1: {
                 "id": 1,
@@ -82,14 +84,14 @@ def all_data():
         }
     }
 
-    return all_data
+    return get_all_data_provider(data)
 
 
 @pytest.mark.asyncio
-async def test_main_items(all_data):
+async def test_main_items(all_data_provider):
     element: Dict[str, Any] = {}
 
-    data = await projector.item_list_slide(all_data, element, 1)
+    data = await projector.item_list_slide(all_data_provider, element, 1)
 
     assert data == {
         "items": [
@@ -106,10 +108,10 @@ async def test_main_items(all_data):
 
 
 @pytest.mark.asyncio
-async def test_all_items(all_data):
+async def test_all_items(all_data_provider):
     element: Dict[str, Any] = {"only_main_items": False}
 
-    data = await projector.item_list_slide(all_data, element, 1)
+    data = await projector.item_list_slide(all_data_provider, element, 1)
 
     assert data == {
         "items": [
diff --git a/tests/unit/motions/test_projector.py b/tests/unit/motions/test_projector.py
index c829070d0..257d60150 100644
--- a/tests/unit/motions/test_projector.py
+++ b/tests/unit/motions/test_projector.py
@@ -4,14 +4,13 @@ import pytest
 
 from openslides.motions import projector
 
-from ...integration.helpers import all_data_config, all_data_users
+from ...integration.helpers import get_all_data_provider
 
 
 @pytest.fixture
-def all_data():
-    return_value = all_data_config()
-    return_value.update(all_data_users())
-    return_value["motions/motion"] = {
+def all_data_provider():
+    data = {}
+    data["motions/motion"] = {
         1: {
             "id": 1,
             "identifier": "4",
@@ -143,7 +142,7 @@ def all_data():
             "change_recommendations": [],
         },
     }
-    return_value["motions/workflow"] = {
+    data["motions/workflow"] = {
         1: {
             "id": 1,
             "name": "Simple Workflow",
@@ -151,7 +150,7 @@ def all_data():
             "first_state_id": 1,
         }
     }
-    return_value["motions/state"] = {
+    data["motions/state"] = {
         1: {
             "id": 1,
             "name": "submitted",
@@ -217,7 +216,7 @@ def all_data():
             "workflow_id": 1,
         },
     }
-    return_value["motions/statute-paragraph"] = {
+    data["motions/statute-paragraph"] = {
         1: {
             "id": 1,
             "title": "§1 Preamble",
@@ -225,7 +224,7 @@ def all_data():
             "weight": 10000,
         }
     }
-    return_value["motions/motion-change-recommendation"] = {
+    data["motions/motion-change-recommendation"] = {
         1: {
             "id": 1,
             "motion_id": 1,
@@ -251,14 +250,14 @@ def all_data():
             "creation_time": "2019-02-09T09:54:06.256378+01:00",
         },
     }
-    return return_value
+    return get_all_data_provider(data)
 
 
 @pytest.mark.asyncio
-async def test_motion_slide(all_data):
+async def test_motion_slide(all_data_provider):
     element: Dict[str, Any] = {"id": 1}
 
-    data = await projector.motion_slide(all_data, element, 1)
+    data = await projector.motion_slide(all_data_provider, element, 1)
 
     assert data == {
         "identifier": "4",
@@ -304,10 +303,10 @@ async def test_motion_slide(all_data):
 
 
 @pytest.mark.asyncio
-async def test_amendment_slide(all_data):
+async def test_amendment_slide(all_data_provider):
     element: Dict[str, Any] = {"id": 2}
 
-    data = await projector.motion_slide(all_data, element, 1)
+    data = await projector.motion_slide(all_data_provider, element, 1)
 
     assert data == {
         "identifier": "Ä1",
@@ -331,10 +330,10 @@ async def test_amendment_slide(all_data):
 
 
 @pytest.mark.asyncio
-async def test_statute_amendment_slide(all_data):
+async def test_statute_amendment_slide(all_data_provider):
     element: Dict[str, Any] = {"id": 3}
 
-    data = await projector.motion_slide(all_data, element, 1)
+    data = await projector.motion_slide(all_data_provider, element, 1)
 
     assert data == {
         "identifier": None,