So far every area seems to be relatively small. Like Doom 2016 arenas. Dungeons seem to be self contained and the Overworld is zoomed out, so it’s not so large either. Only stutters I have noticed where shortly after resuming from standby but they are gone after a minute. But I don’t play with an FPS counter visible so that’s only based on my feelings.

At the beginning there are huge crowds of people but that doesn’t seem to influence FPS at all. And at some points I was astonished at how good a cut scene looks, thinking it was pre recorded but then I noticed the characters wearing my custom clothes

In the end FPS are only important in the fights to hit the QTEs. And they are very limited in scope. Only effects could be a problem, that’s why they are most important to keep at Low.