Not sure whether this helps or not, but it did help me when I had 'problems' with the graphics.

Go to Larian Studios folder (usually on your c: drive) under this address "%AppData%\Local\Larian Studios\Baldur's Gate 3\LevelCache".

Make a save copy of all the folders (they are numbered) inside.

Delete all the folders at this location.

In my case the game run smoothly afterwards