replace smoothScrollTo with scrollTo.

app/src/main/java/chat/rocket/android/fragment/chatroom/RoomFragment.java

@@ -198,7 +198,7 @@ public class RoomFragment extends AbstractChatRoomFragment
   private void scrollToLatestMessage() {
     RecyclerView listView = (RecyclerView) rootView.findViewById(R.id.recyclerview);
     if (listView != null) {
-      listView.smoothScrollToPosition(0);
+      listView.scrollToPosition(0);
     }
   }