Well I have an ATI card, and had the same problem many people had with the really slow scrolling text at the start of missions, but unfortunately the fix offered in the support articles does not work for me. I have gone into CCC and set "Wait for vertical refresh" to "Always on" (even tried putting Triple buffering for OpenGL settings on too) but it does not change anything. When I enable performance in the game menu, it starts the frame rate is something like 2,500~, which is insane, and when I test video settings it gets about 450 fps.

I have a 2GB card but I never thought it would be such a problem, am I doing something wrong, is there anything else I can do?

Scratch that, a reinstall of drivers (or it might of been the reboot) has worked, the vertical refresh is working now.