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How to Fix iOS 15 Performance Problems



As we push away from the latest iOS 15 release we’re hearing about a variety of performance issues plaguing iPhone users.

While many iPhone users are having a great experience on Apple’s new software, others are complaining about bugs and performance problems.

The current list of iOS 15 performance issues includes UI lag, freezes, lock ups, and random reboots. These are extremely common, particularly on aging iPhone models. Newer iPhones like the iPhone 13 series aren’t immune to performance problems though.

Performance issues can be difficult to fix. And while you might be able to fix them on your own, others may require a fix from Apple in a new software update. In some cases, you may need to contact Apple support or bring your iPhone into an Apple Store.

If you can’t wait for a new version of iOS and/or you don’t have time to get in touch with Apple support, we have some fixes that could help fix the issue(s) you’ve encountered on your phone.

Restart Your Phone

If you start noticing UI lag or another performance issue after install iOS 15 (or the latest iOS 15 update), try restarting it. Power it down, leave it off for a minute, and the turn it back on. This has resolved many issues for us in the past.

Update Your iPhone

Apple will occasionally push new iOS 15 software for your iPhone. Point updates (x.x.x) are usually focused on fixing bugs while milestone upgrades (x.x) usually deliver a mix of new features, enhancements, and bug fixes.

The company might not call out performance fixes in an iOS update’s change log, but new software always has the potential to help (or, in some cases, hurt) your iPhone’s overall performance.

For more on the latest version of iOS 15, take a look at our guide.

Update Your Apps

If you haven’t done so already, make sure you update your applications to the latest version.

App developers are currently rolling out iOS 15 support updates and they could help stabilize iOS 15’s performance on your iPhone.

Before you install the latest version of an app you’ll want to go into the App Store and read reviews from other iOS 15 users. If the reviews are mostly good, download the latest version.

Cleanup Your iPhone’s Storage

If you’ve had your iPhone for awhile you might have a ton of clutter taking up space on its internal storage. Deleting this clutter could help speed up your iPhone. This is especially true if you’re almost out of space.

To start, you’ll want to check and see how much space is free on your iPhone. Here’s how to do that:

  • Head into Settings.
  • Tap General.
  • Tap iPhone Storage.

Apple will make some recommendations based on your utilization of your iPhone’s storage, but you can also just go through each section manually delete files you don’t need.

Stop Using Background App Refresh

Background App Refresh refreshes apps in the background to show you the latest data when you open them up. It also makes your phone work in the background. So, if you don’t need this, you might want to shut the feature off.

  • Go into the Settings app.
  • Tap General.
  • Tap Background App Refresh.
  • At the top of this screen tap Background App Refresh and toggle it off.

If you want to keep it on for some apps, leave it on and then go down your list of apps and manually turn it off for apps you don’t use.

Reset All Settings

If you’re still not getting the kind of performance you’d like out of your iPhone, try resetting your settings. Here’s how to do that on iOS 15:

  • Go to Settings.
  • Tap General.
  • Tap Reset Transfer or Reset iPhone.
  • Tap Reset.
  • Tap Reset All Settings.
  • Enter your passcode if you have one enabled.

This will restore your iPhone’s settings to their factory defaults so be sure you have your Wi-Fi passwords handy. You’ll need to re-enter them.

Downgrade iOS

If you can’t find a fix for your problem and/or don’t want to wait for Apple’s next iOS 15 update, you can try downgrading back to the previous version of iOS. Your downgrade options will change over time and sometimes downgrading won’t be available.

For more on the iOS downgrade, take a look at our walkthrough.


If you can’t find a fix for your issue, and you want to avoid taking your iPhone into a store, you might want to restore your device. This should only be used as a last resort.

You can do this via Finder, iTunes, or iCloud.

4 Reasons Not to Install iOS 15 & 11 Reasons You Should

Install iOS 15 for Better Security

Install iOS 15 for Better Security

If security is important to you, think about installing Apple's iOS 15 update right away.

iOS 15 brings numerous security patches to your iPhone. If you're interested in the exact nature of these improvements, you can read about them over on Apple's security website.

If you skipped iOS 14.8 or any older versions of iOS, you'll get the security patches from those updates with your iOS 15 update as well. 

In addition to those patches, iOS 15 comes with some security and privacy upgrades including improvements to Siri. Requests made to Siri are now processed on the device itself using Neural Engine. This makes it more secure. 

If you're an Apple Card user, you'll now get a security code that changes regularly to use when you make online transactions. 

Apple's also included a built-in authenticator that's similar to Google Authenticator. This will let you generate verification codes for enhanced sign-in security under your Passwords.

There's also a Mail feature that hides your IP address and the company's added a new App Privacy report that will tell you when an app has accessed sensitive information. 

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