Dude, i have one word for you (well, kinda)... x64. My basic system specs are:
GeForce 8600GT
AMD Sempron LE-1100 1.90 GHz
1.5 GB RAM
and I've used both 32-bit and 64-bit (Just installed 64-bit) and on my 32-bit installation it runs sooooo slow and it lags soooooo much, but on my 64-bit installation i tested out some of the included sample levels (the ones that show off all the effects such as: ragdoll physics, smoke/steam, explosions, allies, etc.) and it ran soooooo fast i was blown away!! I mean as you can see my system specs arent the best out there, but 64-bit Vista brings out the best it can offer. So that was a mouthful, but remember 64-bit=YES, 32-bit=NO!!! lol
-JustDC
EDIT: I just played a multiplayer map that "icycold 2367" made and it was running at up to 80 FPS!!!!!! You really should switch to 64-bit. I can't even tell you how much i'm impressed by it
That map would probably run at like 5 FPS MAXIMUM on my old OS Installation. LOL
Current Project: Die For Your Life: The Beginning Release 2 for DirectX 10
Justin Cutler, CEO and Founder of Atomic Entertainment http://www.officialatomicentertainment.com/