improved performance and battery usage on older devices

lib/api/marianumcloud/talk/room/get_room.dart

@@ -1,3 +1,4 @@
+import 'package:flutter/foundation.dart';
 import 'package:http/http.dart' as http;
 
 import '../../nextcloud_ocs.dart';
@@ -10,8 +11,12 @@ class GetRoom extends TalkApi<GetRoomResponse> {
   GetRoom(this.params) : super('v4/room', null, getParameters: params.toJson());
 
   @override
-  GetRoomResponse assemble(String raw) =>
-      GetRoomResponse.fromJson(NextcloudOcs.decode(raw));
+  GetRoomResponse assemble(String raw) => _parseRooms(raw);
+
+  // The room list with status is 100–250 KB and polled every 15–60 s.
+  @override
+  Future<GetRoomResponse> assembleAsync(String raw) =>
+      compute(_parseRooms, raw);
 
   @override
   Future<http.Response> request(
@@ -20,3 +25,6 @@ class GetRoom extends TalkApi<GetRoomResponse> {
     Map<String, String>? headers,
   ) => http.get(uri, headers: headers);
 }
+
+GetRoomResponse _parseRooms(String raw) =>
+    GetRoomResponse.fromJson(NextcloudOcs.decode(raw));