What a bold statement. Moving around the OS my 8 is faster (slightly) than my 7, with much fewer dropped frames. Certain tasks (that I haven’t seen with personal usage) are unoptimizable for the 8, as I’ve seen in some YouTube speed tests. Those slowdowns are isolated to specific apps and won’t be felt by the majority of users. Still, I’m sure Apple will resolve the issues in due time. Remember the iPhone 6 orientation bug at launch? THAT was annoying.