diff --git a/linphone-app/assets/linphonerc-factory b/linphone-app/assets/linphonerc-factory
index 254a4378f..75e2a6033 100644
--- a/linphone-app/assets/linphonerc-factory
+++ b/linphone-app/assets/linphonerc-factory
@@ -8,5 +8,5 @@ ec_filter=MSWebRTCAEC
 record_aware=1
 
 [sip]
-chat_messages_aggregation_delay=500
+chat_messages_aggregation_delay=1000
 chat_messages_aggregation=1
\ No newline at end of file
diff --git a/linphone-app/src/components/participant/ParticipantListModel.cpp b/linphone-app/src/components/participant/ParticipantListModel.cpp
index d90a31daa..9a9389275 100644
--- a/linphone-app/src/components/participant/ParticipantListModel.cpp
+++ b/linphone-app/src/components/participant/ParticipantListModel.cpp
@@ -175,9 +175,6 @@ void ParticipantListModel::updateParticipants () {
 			}
 			if( itParticipant == mList.end()){
 				auto participant = QSharedPointer<ParticipantModel>::create(dbParticipant);
-				connect(this, &ParticipantListModel::deviceSecurityLevelChanged, participant.get(), &ParticipantModel::onDeviceSecurityLevelChanged);
-				connect(this, &ParticipantListModel::securityLevelChanged, participant.get(), &ParticipantModel::onSecurityLevelChanged);
-				connect(participant.get(),&ParticipantModel::updateAdminStatus, this, &ParticipantListModel::setAdminStatus);
 				add(participant);
 				changed = true;
 			}else if(!itParticipant->objectCast<ParticipantModel>()->getParticipant() || itParticipant->objectCast<ParticipantModel>()->getParticipant() != dbParticipant){