UncleScrooge on 19 November 2012
So from what I've read at neogaf the graphics are on par with the 360 version. The slowdown seems to occur only when playing online multiplayer with 1 person on the TV and the other one on the gamepad. That would also explain why the shadows look worse in multiplayer as they obviously had to take care of resources to implement this feature.
So basically it's a non-issue. Thanks for making me all worried about buying a gimped version. 
