The player movement and head bob gives an impression of lag but if you sit still and move the mouse its butter smooth. Something is still a little off though. When using no profile with RaedonPro i get about 50% usage, With Fear2 profile i get around 75% and seems to not stutter as much going from area to area. I know its not the same engine but it is the one that works the best for me at least. VSYNC in my case makes the game run a lot worse.