When Apple released a new version of iOS every year, users tend to have some concerns whenever if their older iPhone models will have slow performance or not due to new features added. iAppleBytes shared videos via YouTube to show comparison between iOS 9.0.1 and iOS 8.4.1 on older iPhone models.
You might notice that iPhone 4s only has small difference like few lags with iOS 9 however it is still running as smooth which isn’t big deal. Several months before Apple announced new iOS 9 at WWDC last June, Apple said they wanted to mainly focusing on performance, stability and bug fixes in the next generation iOS 9.
It makes sense that Apple kept their promise and made it happen for iOS 9.0.1 to give better experience on older iPhone models. It is worth probably definitely to upgrade to iOS 9.0.1 if you like to have new features like Maps with transit added, News app, easy to update via software and much more. Check out videos in the below anytime.