iOS 9 hasn't been smooth on any of my devices.
My iPhone 6 has a delay between tapping on an app and it opening. The new app switcher is also laggy and dropped frames are common. It feels like my iPhone 6 is already 2 years old and in need of replacement.
The iPad Air is just the worst. It's jittery and stutters just opening apps, let alone using the keyboard. Opening a folder causes dropped frame rates. Using Slide-Over has crashed the keyboard. Safari is so slow, especially typing in Safari. This is the first update where I've seen the Air lag; on iOS 7 and 8 it was buttery smooth. I honestly don't know how Apple managed to just murder what had been a fast, capable device on iOS 8.
My iPhone 5 (surprisingly) fared the best going from iOS 8->9. There hasn't been a noticeable drop in performance except for lag in the app switcher.
My iPhone 6 has a delay between tapping on an app and it opening. The new app switcher is also laggy and dropped frames are common. It feels like my iPhone 6 is already 2 years old and in need of replacement.
The iPad Air is just the worst. It's jittery and stutters just opening apps, let alone using the keyboard. Opening a folder causes dropped frame rates. Using Slide-Over has crashed the keyboard. Safari is so slow, especially typing in Safari. This is the first update where I've seen the Air lag; on iOS 7 and 8 it was buttery smooth. I honestly don't know how Apple managed to just murder what had been a fast, capable device on iOS 8.
My iPhone 5 (surprisingly) fared the best going from iOS 8->9. There hasn't been a noticeable drop in performance except for lag in the app switcher.