I think others are experiencing lag because of the retina display. But same here, very few problems on my iPad 2. There is a slight lag with multitasking gestures though.
Did you fresh install no restore from iCloud? I installed gm on iPad 3 from an iCloud back up and had lots of trouble. Lag, apple apps crashing, and email completely broken. Did a fresh install and set up iPad like new device. Works great now. I will be putting 7 on my gf iPad 2 when it's available ota.