The game in general is Laggy and slow on my iPad mini 5 from 2019, and the menus are slower than on my iphone 6 from 2014 so I don't see any reason for the game to run that bad.

I tried many diffrent video settings and world settings, and its always laggy to at least some degree. The game never runs at stable 60 fos for more than 2 minutes.

My iPad isn't cluttered, I always use little storage, and close other apps before running minecraft.