Was it too much to ask for a new OS that is better than the previous version? I mean, they even advertised how it was going to perform better because of Metal and I'm just not seeing that.
It's weird though. SOMETIMES, I'll open an app and it will be just like 8.4.1, but most of the time it's not.
Especially when opening an app that has been completely quit. The zooming animation skips almost the entire animation and the app kind of jolts open. I sort of remember a similar situation when Apple first introduced HDR into the camera app on the iPhone 4. I remember that OS update (and for the rest of iOS 4), the animations were screwed up (especially if your app was closed in landscape mode and then opened in portrait)
Here's a video:
Watch at 1:39 when he opens the iTunes Store. It jolts open instead of the regular smooth animation. That's what is happening on a lot of iOS 9's animations