Hey guys!
I think some people have already seen us talk about this in-game but if you've been struggling with crashing at World Boss this might help!
Before going to Moon Hill, change your game resolution to 1280 x 720 or smaller and reduce all the graphics settings to low, also I've been told if you use reshade you should disable it at World Boss.
I make my game windowed mode so it's faster to open and login after a crash but I didn't notice it crash more or less in fullscreen.
Doing this I normally only crash 2 times during ch0 world boss and after the first 2 or 3 dragons I don't crash anymore. Hope it helps you!