hm larry give me your pc spec, and your game options, i gonna raise up your fps:)
You can help me, i'm lagging with loads of cars around that have a player in it:
Manufacturer:   MicroLink
Processor:   Intel(R) Pentium(R) 4 CPU 3.06GHz (2 CPUs)
Memory:   2000MB RAM
Hard Drive:   154 GB
Video Card:   ATI Radeon HD 3400 Series(need to know how to update drivers, i keep messing up)
Monitor:   Philips 107E (107E2)
Sound Card:   HD Audio rear output 
Speakers/Headphones:   Both
Keyboard:   USB Root Hub
Mouse:    USB Root Hub
Operating System:    Windows XP Home Edition (5.1, Build 2600) Service Pack 3
misc:
I turned on ATI OverDrive, tried if that made a difference, but nothing:
Memory clock: 252MHz
GPU Clock: 110MHz
Playing resolution: 1024x768
Color: 32bit
Anti aliasing: off
Draw distance: full
Visual FX: Low
I've heard that the sound sample rate can create lag too, is that true?
Some other sidenotes:
I play MW2 on medium quality(textures only), no shadows and anti aliasing.