1) animations laggy in landscape mode when closing heavy app
2) samsung internet animation lag when closing it
3) delay when opening recents app on home screen
4) animation delay when trying to open an app and quickly close it (you have to wait for the animation for whatever reason, not a problem on pixel 4 or beta 2 of one ui)
not the problem, since I factory resetted it (deleted everything) 2 weeks ago and never restored backup. Software problem
Then you could try the safe mode. Should it work better in the safe mode, then it's a third party app that's causing the problems.