I have the Adobe Creative Suite 3 and I use Photoshop to create comics and complete drawings. Lately, I have been having a serious trouble with brush lag. The more I draw and color, the farther behind the brush gets from the curser. It doesn't matter what input device I use (Intuos 3 pen or USB mouse), I still have the same issue. I don't really know how to fix it. I know it is not my computer's performance; I have Windows 64 bit, a Sandy Bridge i7, 16 gigs of ram, and a Radeon HD6850.
I'd appreciate any advice or suggestions.