I just registered to say that I have the exact same problem as above, and need help. I've tried reverting drivers and that made the game unplayable (crashing, had to reinstall it). While ingame if you just move the graphic slider back and then return it or wherever (it doesn't seem to matter) the lag goes away, but it's driving me nuts on why I had to do this every time I enter a new area.
I was told on another forum (gamefaqs) that it might have to do with the screen resolution not matching on my display with ingame, and everything is matched at 1024 x 768 resolution with 85 refresh rate. Help please!
My system specs are :
2 gigs ram
Geforce 6600 256mb
intel pentium 4 3.4ghz
