iOS 7 is the first Apple system where I felt royally screwed. My iPhone 4 became so slow as to be nearly unusable. Everything now takes seconds, swipes are being missed, even audio gets chopped up when I play back podcasts over bluetooth.<p>There are two reasons for me to be angry about this:<p>* Apple should never have released iOS 7 for iPhone 4 devices. iPhone 4 should have been listed as "unsupported". But had they done that, they would have ended up with a fragmented ecosystem, and unable to brag about how so-and-so-many percent of users upgraded to the latest iOS.<p>* There is <i>no good reason</i> for iOS 7 to be slower than iOS 6. The "it requires more processing power for animations" reason is bogus, because there are very few animated effects, and I switched off whatever I could anyway. The only reason every iOS release is slower than the previous one is because Apple does not care about optimizations. They can afford not to care because every new hardware device is much faster than the previous one. But that means some users get royally screwed.<p>I should have stayed with iOS 6 (there is no going back now), but more importantly, Apple should not have claimed that iOS 7 is supported on my device. For all practical purposes, it isn't — the experience is really bad. I've just compared it to an iPhone 3G running iOS 4.2.1, it's more responsive than iOS 7 on iPhone 4.<p>So, this forced migration to iOS 7 is something that makes me angry, because I'm that part of the userbase than is being dragged into it kicking and screaming.