i know somepoeple allready posted some config tweaks but i got some more you can try it helpt me alot
first go in local :c drive then go c:program files / steam / steamapps / common / call of duty blackops / players / config.mp
make sure you open config.mp using wordpad
1. seta cl_maxpackets "100"
2. seta com_maxfps "125"
3. seta r_multigpu if you have 1 videocard put it on "0" if you have more put it on "1"
4. seta r_multithreaded_device "1"
5. seta snaps "30"
6. seta sv_maxrate "25000"
optional settings: if you still have lag
7. seta r_specular "0" this will make the colors on your guns and equipment less bright
8. seta r_blur_allowed "0" this will make the blur when you scope down your gun go away
9. ragdoll_enable "0"
10. open up your multiplayer black ops game then go to taskmanager go processes find blackopsmp.exe right click it go to set priority and put it on realtime it will maybe set it on high that good to
11.open up your steam go game library right click call of duty blackops mp then go to properties local files and click verify integrity of game cache
12. open up your console in game press ~ its next to your 1 button and typ /stoprecord
i hope this will help you out
comfort>XI< i got some more tweak and ill will post them when i tested them out