I play on my PS3 all the time, with wifi. I noticed the ONLY time I ever experienced lag was during the Marlboro Fate in North Shroud I think it was, maybe East Shroud. But anyway, yeah at that point the game gets laggy, but it's still playable. It just slows down and my abilities and everything slow down a bit. There's always a bunch of people there trying to kill it though, so that could be it.