TinouX on 20 February 2009
I've been playing SFIVfor the last couple of days on the PS3 and I've never noticed any lag (or any PS3 game for that matter). There's also a lot of players online, so much so that I haven't gotten a chance to go into the Arcade mode too much.
Either way, both the 360 and PS3 versions are awesome. Just enjoy the game.
