I guess its OK.
I was a little worried and thought my system was acting strange. 3D is about 5% slower, but I don't care. I game @ 1280x1024 so it doesnt make no difference. 100FPS or 105FPS. Who cares?
I really like Vista.
Edit; I think nV will release drivers that are as fast as in XP soon. When the HD2800 is releasing I think nV will release a "super" driver just to bug Ati... (I hope.. LOL)