diff --git a/back/src/Controller/IoSocketController.ts b/back/src/Controller/IoSocketController.ts
index f220aedb..56168804 100644
--- a/back/src/Controller/IoSocketController.ts
+++ b/back/src/Controller/IoSocketController.ts
@@ -149,26 +149,6 @@ export class IoSocketController {
         return null;
     }
 
-    private sendUpdateGroupEvent(group: Group): void {
-        // Let's get the room of the group. To do this, let's get anyone in the group and find its room.
-        // Note: this is suboptimal
-        const userId = group.getUsers()[0].id;
-        const client: ExSocketInterface = this.searchClientByIdOrFail(userId);
-        const roomId = client.roomId;
-        this.Io.in(roomId).emit(SockerIoEvent.GROUP_CREATE_UPDATE, {
-            position: group.getPosition(),
-            groupId: group.getId()
-        });
-    }
-
-    private sendDeleteGroupEvent(uuid: string, lastUser: User): void {
-        // Let's get the room of the group. To do this, let's get anyone in the group and find its room.
-        const userId = lastUser.id;
-        const client: ExSocketInterface = this.searchClientByIdOrFail(userId);
-        const roomId = client.roomId;
-        this.Io.in(roomId).emit(SockerIoEvent.GROUP_DELETE, uuid);
-    }
-
     ioConnection() {
         this.Io.on(SockerIoEvent.CONNECTION, (socket: Socket) => {
             const client : ExSocketInterface = socket as ExSocketInterface;
@@ -498,11 +478,7 @@ export class IoSocketController {
                 this.connectedUser(user1, group);
             }, (user1: string, group: Group) => {
                 this.disConnectedUser(user1, group);
-            }, MINIMUM_DISTANCE, GROUP_RADIUS, (group: Group) => {
-                //this.sendUpdateGroupEvent(group);
-            }, (groupUuid: string, lastUser: User) => {
-                //this.sendDeleteGroupEvent(groupUuid, lastUser);
-            }, (thing: Movable, listener: User) => {
+            }, MINIMUM_DISTANCE, GROUP_RADIUS, (thing: Movable, listener: User) => {
                 const clientListener = this.searchClientByIdOrFail(listener.id);
                 if (thing instanceof User) {
                     const clientUser = this.searchClientByIdOrFail(thing.id);
diff --git a/back/src/Model/World.ts b/back/src/Model/World.ts
index 9a5e35ff..6e739c02 100644
--- a/back/src/Model/World.ts
+++ b/back/src/Model/World.ts
@@ -14,10 +14,6 @@ import {Movable} from "_Model/Movable";
 export type ConnectCallback = (user: string, group: Group) => void;
 export type DisconnectCallback = (user: string, group: Group) => void;
 
-// callback called when a group is created or moved or changes users
-export type GroupUpdatedCallback = (group: Group) => void;
-export type GroupDeletedCallback = (uuid: string, lastUser: User) => void;
-
 export class World {
     private readonly minDistance: number;
     private readonly groupRadius: number;
@@ -28,8 +24,6 @@ export class World {
 
     private readonly connectCallback: ConnectCallback;
     private readonly disconnectCallback: DisconnectCallback;
-    private readonly groupUpdatedCallback: GroupUpdatedCallback;
-    private readonly groupDeletedCallback: GroupDeletedCallback;
 
     private itemsState: Map<number, unknown> = new Map<number, unknown>();
 
@@ -39,8 +33,6 @@ export class World {
                 disconnectCallback: DisconnectCallback,
                 minDistance: number,
                 groupRadius: number,
-                groupUpdatedCallback: GroupUpdatedCallback,
-                groupDeletedCallback: GroupDeletedCallback,
                 onEnters: EntersCallback,
                 onMoves: MovesCallback,
                 onLeaves: LeavesCallback)
@@ -51,8 +43,6 @@ export class World {
         this.disconnectCallback = disconnectCallback;
         this.minDistance = minDistance;
         this.groupRadius = groupRadius;
-        this.groupUpdatedCallback = groupUpdatedCallback;
-        this.groupDeletedCallback = groupDeletedCallback;
         // A zone is 10 sprites wide.
         this.positionNotifier = new PositionNotifier(320, 320, onEnters, onMoves, onLeaves);
     }
@@ -138,7 +128,6 @@ export class World {
         // At the very end, if the user is part of a group, let's call the callback to update group position
         if (typeof user.group !== 'undefined') {
             this.positionNotifier.updatePosition(user.group, user.group.getPosition(), oldGroupPosition ? oldGroupPosition : user.group.getPosition());
-            //this.groupUpdatedCallback(user.group);
         }
     }
 
@@ -174,7 +163,6 @@ export class World {
         }
         group.leave(user);
         if (group.isEmpty()) {
-            //this.groupDeletedCallback(group.getId(), user);
             this.positionNotifier.leave(group);
             group.destroy();
             if (!this.groups.has(group)) {
@@ -183,7 +171,6 @@ export class World {
             this.groups.delete(group);
         } else {
             this.positionNotifier.updatePosition(group, group.getPosition(), group.getPosition());
-            //this.groupUpdatedCallback(group);
         }
     }
 
diff --git a/back/tests/WorldTest.ts b/back/tests/WorldTest.ts
index 580677c7..63e46928 100644
--- a/back/tests/WorldTest.ts
+++ b/back/tests/WorldTest.ts
@@ -13,7 +13,7 @@ describe("World", () => {
 
         }
 
-        const world = new World(connect, disconnect, 160, 160, () => {}, () => {}, () => {}, () => {}, () => {});
+        const world = new World(connect, disconnect, 160, 160, () => {}, () => {}, () => {});
 
         world.join({ userId: "foo" }, new Point(100, 100));
 
@@ -40,7 +40,7 @@ describe("World", () => {
 
         }
 
-        const world = new World(connect, disconnect, 160, 160, () => {}, () => {}, () => {}, () => {}, () => {});
+        const world = new World(connect, disconnect, 160, 160, () => {}, () => {}, () => {});
 
         world.join({ userId: "foo" }, new Point(100, 100));
 
@@ -69,7 +69,7 @@ describe("World", () => {
             disconnectCallNumber++;
         }
 
-        const world = new World(connect, disconnect, 160, 160, () => {}, () => {}, () => {}, () => {}, () => {});
+        const world = new World(connect, disconnect, 160, 160, () => {}, () => {}, () => {});
 
         world.join({ userId: "foo" }, new Point(100, 100));