Performance for me on a 980ti @ max and 2560 was flawless up until the last patch. Now, I'm getting quite severe stutter and menu hang every few minutes. I was really enjoying the game, but turned it off out of frustration last night. You'll probably be ok.
I'm on a 980ti and had to turn textures down to very high to stop stuttering and menu lag. Not enough vram.
I noticed it was inconsistent as I moved around a scene. They did atleast put in settings to control X and Y sensitivity - on release there was a 5% difference between them. I dunno why it is so hard for developers to get mouse code done properly in this day and age.

