could u post the steps u already tried (remember not to use any outside links) but you can use youtube
also what could help to set connection type in black ops 2 to "BEST"
i have a 8Mbit connection 1MB/s download - 110 kbps Upload
i have a 1 GB ATI RADEON HD 6850 GFX card
8 GB RAM
3.2 Ghz 4cores processor
i also had some lag and only changed
i have put "sync every frame" to NO
and put "Anti anilisyng" to 2x
the rest is high now running smoothless