Has anyone else tried the public beta on 1st gen iPad air? For all the "stability" that was touted at the keynote, I'm very disappointed to see that the app switcher and safari are plagued by lag and jitteriness. Even if you turn off transparency and reduce motion, it's still not very pleasant. Anyone have a similar experience? Is this to be expected given it's a beta - although a public beta now... Any thoughts on whether there's a chance of it being smoothed out, historically-speaking with possibly other betas that were terrible with UI at this point?