Anyone else having problems with it being jerky? at the start of the demo when you get through the locked door and go down a ramp, that part is totally unplayable on my PC. So bad that i always die before getting through the next door. Before that point its smooth but with the occational jerk. I've brought the detail down to medium to see if that would make any difference but it didnt.

Any ideas? I've not tried these new Catalyst drivers yet though, might be worth a shot.

nm seems to be a common problem

What, that it's just not very fast?