I don't know about the GM version, only tried on my development device - iPod touch, and it does seem a bit sluggish, but I just finished installing the final version of iOS 7 on my iPad 3, it feels a lot better compared to the GM on my iPod touch.
I tried playing Asphalt 8 which sucks big time on iOS 7 GM with iPod touch, there's no problem with the iPad 3.
Also tried most apps I installed, mostly for reading, no (noticeable performance issue).
Note that I haven't investigate possible free space issue, in the iPad there's about 50% space left, while in the iPod touch there's about 15% space left.
I tried playing Asphalt 8 which sucks big time on iOS 7 GM with iPod touch, there's no problem with the iPad 3.
Also tried most apps I installed, mostly for reading, no (noticeable performance issue).
Note that I haven't investigate possible free space issue, in the iPad there's about 50% space left, while in the iPod touch there's about 15% space left.