Thanks for the elaborate tips! Alas, none of that is the case, and it is indeed my GPU that's handling the graphics. Right now I'm suspecting corrupted save files, and am trying if a fresh playthrough will go better.
I got these too. Other games ran fine. However, shortly after my PC started crashing at random for a bit. The type as if you pulled the electricity from one second to the next. Then, that stopped some days later.
I've been having issues with random freezes for a while in bg3 before that. First, disabling cross save fixed it. Then it came back and my game would freeze for up to 10s at a time. Then, the freezes got shorter, but my game crashed.
After a crash that shut my whole PC down, the Bg3 launcher disappeared. At this point, I gave up on early access lmao