Windows 7 64 here, but know others who are on 8/8.1 and have the same issues.
Just tonight or for awhile? unpark cores if not already.
It does feel very sluggish, particularly when you compare it to bf3. It is extremely smooth running. Ive been pondering a move to win 8.1 for a while now. But for just one game it doesnt seem like it's worth it at times. Cpu wise, im seeing upto 94% max, averaging 65% 0no, 4770k with ht on. Pretty similair to what i got in bf3 with this chip, and a previous 4.5ghz 3770k.Win 8.1, cores unparked and everything.
Its just the game, has had a sluggish feel to it from the start.
When I'm trying to play seriously (lol) I drop lighting, post processing, effects to low and turn off MSAA as that seems to add a certain sluggishness to the game for some reason and just use FXAA, leaving the rest of the settings on ultra except terrain decoration. That way I can hold an almost constant capped 125fps (reduces visible tearing with vsync off at 120Hz) and the game feels relatively smooth and still looks fairly good aside from the blocky lighting in places.
Good games tonight chaps. I was aKerfuffle.
Already do that and just up resolution scaler to 130%