The 5570 can't play Crysis 2 on Ultra, unless you didn't install any of the eye candy patches and are running it at a really low resolution. It's a cheap budget card, that's simply not what it was ever intended to do.
As far as your "graphics lag" you'll need to be more precise. What framerate are you getting, and what do you expect it to be? What is your resolution? What settings are you using in WoW?