A lot of people said that patch 3 threw their FPS into the gutter. I held off updating the game on my laptop but today I gave up and updated the game because running Steam offline was becoming a bother. Well, that was a mistake. The game used to run as smooth as butter. It is now a choppy mess, it's like the game is fighting against me. Slow reactions to absolutely everything, animations not keeping up with audio, slow, laggy, you name it I got it.
I cleared my LevelCache out of desperation, and surprise, it worked. So long as I clear the LevelCache each time before I play there is no problem. Go to " %LocalAppData%\Larian Studios\Baldur's Gate 3\LevelCache " if you want to try the same.