weird. maybe its windows. i have
hardware
- z77
- intel i5 3570
- 660 ti
- 8 gb ram
- 250gb ssd
- win 7
game settings
- full hd 1920x1080 @60hz
- vsync off
- this blurred vision thing off
- everything else as high as possible
for me it runs fine. no lags, no nothing.
just for comparsion. maybe it can help you...