Along with the new features, iOS 9 promised an improvement to the ‘foundation’ of iOS with performance boosts and battery usage improvements across the system. However, as always seems to happen with new versions of iOS, not all users are satisfied. There have been many reports that iOS 9 is causing lagginess, especially on older hardware such as the iPhone 5. Some phones are getting stuck on the ‘slide to upgrade’ screen and users are frozen out of their devices completely.

Seeing as iOS 9 supports all the same devices as iOS 8, it’s quite important that the OS runs well on all iPhones and iPads, not just the recent Apple devices with the faster A7 or A8 processors.

How has the iOS 9 affected your iPhone? Is it slower than before the update … or maybe it’s actually faster? Let us know with the following poll …

Let us know in the comments if you are having problems and mention what devices you are using. For those affected, you can try the usual tactics of factory resetting the device rather than restoring from a backup. This works for a lot of people where something slightly weird happened whilst updating. Otherwise, it may be worth holding off until Apple releases a revision update for iOS 9 — many beta users report iOS 9.1 is a lot more stable and responsive than iOS 9.0 is.

Here’s a good comparison of iOS 8.4.1 vs iOS 9 on all of Apple’s supported iPhones for reference. If your iPhone is substantially slower than what’s shown in this video, then there’s probably something wrong and you should consider resetting and starting over.

You can read our full walkthrough of iOS 9’s new features here. Apple’s iPhone 6s and 6s Plus but we expect performance on them to be stellar as they ship with Apple’s newest A9 chips.

FTC: We use income earning auto affiliate links. More.

Check out 9to5Mac on YouTube for more Apple news: