I am using a Fairphone 3+ for one year now.
I knew, that it had limited (older) Hardware, but in the past my FF3+ sometimes hangs for some seconds.
I have no idea, how to find the reason for the problems.
Is there somewhere a CPU usage (so I see the possible reason for the problems).
I have the Microsoft Launcher installed, because here I see at every app, that has new messages (like Signal) a counter of unread messages.
This is (as far as I can see) not possible in the default Launcher.
I got the same issue with my FP3 with updated front Camera. It seems like this has got worse since the last update to Android 11. I use the Nova Launcher and I have 12GB free space.
Whould be great to find a solution.
I had no issues with my FP3 after the upgrade, in the meantime I installed Iode (also Android11) and the first few days it was a bit laggy, but now its running smooth. Even my FP2 was running most times good with Android 11, so I doubt the FP3(+) is too weak. Also I doubt its a global issue. Overall it depends as well a lot on your setup, Apps you use etc…