The way I understand it, disabling FSR is supposed to make performance worse, or at least GPU more busy. That and increasing some settings from medium to high has the potential to slow things down to unplayable level. But maybe if you decrease the FPS to 30 it’ll be okay, dunno.

For me changing the FSR mode from the default was more of a way to get rid of the blur.

Eagerly waiting for FSR2 which I’ve heard is going to be implemented in one of the patches.