Long time user of LE (since the fork) with the same hardware, RPi2.
LE9 perfect. LE10 brought some delays, but LE11 has left the system not usable.
The upgrade, automatic, went flawlessly, with no noteworthy messages. The DB seemed to be migrated with no problem but after the first reboot the system is extremely luggish.
When you start a movie or a TV episode it can be almost a minute to show the circle and then up to 3-5 to start the video. The playback is fine.
Updating the Library it has been impossible staying in "Preparing" for hours, then not advancing past 80% in the first Video Source (of 4 video sources). Maybe 60-70% of the library have associated NFO files.
I leaning to reinstall from a clean image and rebuild the library from scratch, but before doing this I would like to know if I am hopeless and I should look for a RPi4 (yes, the one that seems to be made of gold).
Thank you in advance.