Well it might be.It'll be fixed in the patch
Personally Ive no keyboard lag or any other issues (as ive said in a few other threads)
AthlonXP 2600+ 2.08ghz
640mb Ram
6800GT 256mb
SB Audigy
Also dcovell, you need to start posting real information if you want help. It will take forever to try and help you find out if theres something you could do to improve it if you're telling us your specs via a series of clues or sarcastic comments.
Have a read through the sticky at the top explaining about improving FPS, alot of those will help reduce CPU load aswell which could help smooth out your keyboard actions.