iOS 9.0.2 was released the other day by the Apple company and today we see a comparison with iOS 8.4.1 on the iPhone 4S, iPhone 5 and iPhone 5S, the terminals that are most affected in performance by the new version of the operating system for our terminals.
In the videos below you will see that from iPhone 5S to iPhone 5 and iPhone 4S iOS 9.0.2 performance drops, but on the first of them the differences between iOS 9.0.2 and iOS 8.4.1 they are not really as big as many people would imagine, on the contrary.
In the case of the iPhone 4S, it is clear that iOS 8.4.1 works much better than iOS 9.0.2 and this was perfectly normal, this terminal being 4 years old and outdated in all respects, so you cannot expect to a lot from him in this regard.
