improve chat

src/app/services/chat/viewed-message.service.ts

@@ -1,5 +1,6 @@
 import { Injectable } from '@angular/core';
 import * as FIFOProcessQueue from 'fifo-process-queue';
+import { async } from 'rxjs';
 import { RoomService } from './room.service';
 
 @Injectable({
@@ -21,11 +22,15 @@ export class ViewedMessageService {
           room.deleteMessageToReceive(userId)
         }
 
+        let n = 0
         for (const message of room.messages) {
           if(message.online) {
             for(let id of membersIds) {
               if(message.addReceived(id)) {
-                await message.saveChanges()
+                n++
+                setTimeout(async() => {
+                  await message.saveChanges()
+                }, 100 * n)
               }
             }
           }
@@ -44,13 +49,18 @@ export class ViewedMessageService {
 
     const membersIds: string[] = room.membersExcludeMe.map((user)=> user._id)
 
+    let n = 0
     for (const message of room.messages) {
       if(message.online) {
         for(let id of membersIds) {
 
           if(message.addViewed(id)) {
             message.addReceived(id)
-            await message.saveChanges()
+            n++
+            setTimeout(async() => {
+              await message.saveChanges()
+            }, 100 * n)
+            
           }
         }
       }