I know we have a lot of people in here who lag on CA.
I myself lag at times.
There are a few ways to help it.
Go onto your settings and turn everything unnecessary off and turn everything to low.
Also, move your TEXTURES.rez out of the "Game" folder.
Anymore things we can do to "fight" lag?
1. Buy 2 GB of Ram. It's not that expensive. I just got mine 2 weeks ago for 25.99 at Frys and it really decreased my lag.
2. Buy a new video card with at LEAST 256mb of video memory if your computer doesn't already have it. To check how much video memory you have download CCleaner and check.
3. Use Disk Defragmenter + Disk Cleanup. It decreases like %20 of the lag occassionally.
4. Moving the Textures.rez out of your Game folder will just screw your gameplay. It would be useful in some maps, but maps like Junk Flea, Snow Valley, Grey Hammer, and Rattlesnake would be challenging without the Textures.rez in there.