Looks like the PC version of Black Ops is a fail due to horrible lag and memory leak spikes. the kiddle console version has been just fine for me :-)
That happens when a game is designed on the lowest common denominator and then tried to be ported to a real system.
It's like taking a coloring book and trying to convert it to a high resolution photograph.
"The inherent vice of capitalism is the unequal sharing of blessings; the inherent virtue of socialism is the equal sharing of miseries." - Winston Churchill