diff --git a/lib/src/room.dart b/lib/src/room.dart
index 9b250053..e1acbb5d 100644
--- a/lib/src/room.dart
+++ b/lib/src/room.dart
@@ -1537,7 +1537,8 @@ class Room {
         Membership.join,
         Membership.invite,
         Membership.knock,
-      ]]) async {
+      ],
+      bool suppressWarning = false]) async {
     if (!participantListComplete && partial) {
       // we aren't fully loaded, maybe the users are in the database
       final users = await client.database?.getUsers(this) ?? [];
@@ -1552,6 +1553,15 @@ class Room {
       return getParticipants(membershipFilter);
     }
 
+    final memberCount = summary.mJoinedMemberCount;
+    if (!suppressWarning && memberCount != null && memberCount > 100) {
+      Logs().w('''
+        Loading a list of $memberCount participants for the room $id.
+        This may affect the performance. Please make sure to not unnecessary
+        request so many participants or suppress this warning.
+      ''');
+    }
+
     final matrixEvents = await client.getMembersByRoom(id);
     final users = matrixEvents
             ?.map((e) => Event.fromMatrixEvent(e, this).asUser)