My iPad Pro arrived this morning and I've been using it all day. I've noticed that some of the animations drop frames, such as opening/exiting the app switcher and folders. Considering how powerful it was made out to be, this shouldn't really be occurring. It could be fixed with the 9.2 update though which has resolved my 6s Plus lag issues, mostly. It's to be expected though because the screen resolution is much higher than the A9 devices yet it doesn't benchmark THAT much higher, meaning I think that the device physically can't handle the animations smoothly.