Actually, it's not even just the menus -- it's also the post-game highlights (i.e. Game Reel, Signature Highlights, etc.). All of these lag/stutter, despite the game running flawlessly.
I have a freshly formatted system with the following specs:
i7 920 @ 2.67 GHz
ATI Radeon HD 4850 w/ 1GB
I've tried setting everything to their lowest settings, but this stutter still occurs. Spent the whole day researching, so any help would be great.