I have pretty much the same problem: erratic very short screen freezes, very much like a stutter. I turned down the sound accel in DXDiag, no difference. I have noticed the stutters seem to be somewhat in sync with the small burbles shown in the net status along with occuring at the end of the gun firing sound. In addition, there is a thin light coloured band that flashes across the very bottom of the screen in sync with the stutters. Any insights?
AMD Tbird 1.4, 512meg SDRAM, ATI Radeon 32SDR, DX8.0a