Animations in built-in apps are buttery smooth, and always have been, ever since the first iPhone. The problem is with newer iOS apps that are either unoptimized or heavily UIWebView based. The newest Gmail app is definitely mostly HTML5, and I suspect this one is as well.
Re:Google Maps for iOS
by FireBeyond on Thursday December 13, 2012 @12:16PM
(#4916750)
I wouldn't go that far, my ex's 3GS struggled when upgraded to iOS 5, and complaints about that were widespread.
I'm not entirely surprised, admittedly - and depending on your use case (for me, anyway), it doesn't so much matter.