So I joined the iOS9 Public Beta earlier this week, and I must say it's been a pretty crap experience:
1) Interscreen swipes are jumpy and slow
2) Apps (both 3rd party and native) crash on a regular basis
3) Launching of apps is significantly slower
I've ran Apple betas in the past, and I'm fully signed up to the fact that a Beta is not the finished product. I just find it interesting to note the (perceived) "unreadiness" of this Beta. Remember that Beta is the step before release. I wonder whether or not Apple is struggling to keep up with the annual hamster wheel that it has created. With growth comes sludge.....