Yeah, my MW2 has got these weird lag-like spikes, and they are starting to be really annoying. And they really randomly, almost always come when i see an enemy. I have watched my killcams and i just stay frozen there. They last like from 0.5 secs to 5 secs (tho really rarely). I have watched my memory usage, and its not high at all when playing. It doesn't matter are the settings on high or low, and resolutions are not the problem either. Temperatures are also ok, and i just installed new drivers, so thats not the problem. And sorry for bad english, its not my main language.
Sorry its not help - just have them too - usualy 0.5 - 2 sec. I'm trying to keep my rotation and it looks WoW is working - just display engine looks frozen. At least I can keep DPS on same level...