I upgraded to Windows 8 and have seen no drop in performance in Black OPS. It's as smooth as ever. I have an Nvidia GTX 660 ti running the latest beta drivers.
I'm willing to bet you're facing a driver issue. Check for the latest or download a beta for your video card if available.
Most of the benchmarks I've seen comparing Win7 to Win8 gaming wise show them to be mostly the same with only a few games slightly quicker on win7, but nothing a player would notice. Some games actually saw slightly better performance with Win8.
I also have very huge fps drops, even at lowest resolution(800x600) and lowest graphic settings i only get about 50 fps . It´s unplayable at normal settings! Althought i play on my notebook it should work fine! I have the newest windows 8 drivers from acer and amd.
i7 2,2 GHz 4-Core
AMD HD 6850M
sorry for my bad english^^
Message was edited by: ReFlex14