Shortly after Persona 4 Arena launched in Japan, Atlus confirmed the Xbox 360 version has laggy online battles.
The game’s director, Wada-san, apologized to fans who bought the Xbox 360 release and said Arc System Works have already made a patch to ameliorate the problem. While the patch is complete, Wada asked players to please wait a little longer so they can test the patch. We’ll post an update when the patch is ready.
Persona 4 Arena comes out next week in North America. Perhaps, Atlus USA will have a patch ready at launch?