Hello I just (had to, kinda) upgrade my Unity version from 5.4.2f2 (64-bit) to 2018.3.3f1. First of all: THANKS that Unity just deinstalled my old version without asking me, great! Second: now I have performance issues where there should be none and my Console has errors that havent been there before. The worst part is that now the game is unplayably slow. And we are talking 2D easy stuff here... This seems to be enhanced if I have an object in the scene selected. Can anyone help?