Low res Quake 3 scores unusually slow

[Evertec]

I have a Celeron @ 866 on an Abit BF6 motherboard, an Inno3d Geforce2 MX with the latest 6.34 drivers overclocked at 190/185. My problem is that on Quake 3, the low res scores are very low compared to what I've seen benchmarked. Here's what I get. (All are on High Quality setting.)
640x480- 66.8
800x600- 66.6
1024x768- 58.8
1600x1200- 24.6
From what I've seen from other people, I should be getting in the hundreds of frames per second in 640x480 and 800x600. Does anyone have any idea as to what could be slowing me down? Thanks.

 

[Killbat]

Check your IRQs, especially if you're running Windows 2000. If too many devices (especially those required by the game) are sharing IRQs, you could see a performance hit.