Intermittant jerkiness when playing 3D-intensive games (Deus Ex and Diablo II were the notable ones). For example, mouse or keyboard commands will update slowly and jerkily on the screen, as if there was a low refresh rate. However, the strangest feature of this problem is that, when I hold down a key on the keyboard, the performance improves! The jerkiness does not totally disappear, but it becomes really reduced. I have tried replacing both the keyboard, the mouse, and the 3D card, and there was no change in performance. I am currently using the GeForce 2 3D card, which should have more than enough power for the games I was experiencing problems with. The computer is a Pentium 3 500, so that should not be the bottleneck either. I have also tried disabling everything I had running in the background (the only applications left are Norton AntiVirus and Adaptec DirectCD Wizard). If anyone has any ideas why holding a key on the keyboard would improve performance, and how to fix this problem, your help would be greatly appreciated.
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