You're telling me I have a case of denial? That's rich!
I dislike animations and I have all of that stuff turned down as much as possible. However, as this thread was developing I turned the animations and wall paper on, on my 5s, and no difference. Maybe there are one or two places that exhibit some animation anomaly, but I look at the big picture. I haven't noticed issues in the control center, weather app, swiping screens etc. I'll grant you with all the different devices from a 4s to s 6s and and iPad 2 to an iPad air 2, different use cases could result in different outcomes and different perceptions.
However a blanket statement that iOS 9 is slower than iOS 8 across every device, in every nook and cranny, every app is just patently false.