I have the xbox version and there is , I repeat NO SLOWDOWN at all, maybe you got a bum copy or your xbox is old, or somthing along those lines. In the three games I played there was no slowdown at all, my game runs smooth as butter, so I'm not sure if what's the deal with your game. oh well, I guess I should be just happy my game plays flawless. For the online games, I don't know about that or care to know, cause i never play online, but off line I never seen slow down.