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9 Simple Tricks to Fix iPhone Running Slow after iOS 15 Update

DoubtUser Concern

“I have problem with my iPhone after update to iOS 15. Some apps not loading some apps running slow even I can't touch my screen when entering to that apps. What should I have to do?”

On September 20, 2020, Apple released the new iOS 15 operating system. After that, there were numerous Apple users saying that their iPhone running slow, apps not responding or loading, apps freezing, and more.

If you notices that your iPhone start going sluggish after upgrading to iOS 15, you're not alone. In this article, we will discuss the issue of iPhone running slow after iOS 15 update and explore all the possible solutions to make your iPhone work more efficiently.

Why Is My iPhone So Slow after iOS 15 Update?

After installing a new firmware update esperically with big file size, your iPhone or iPad will continue to perfrom some background tasks for some time, which makes the device running slower than usual. This is normal, so please be patient and give it a while to process.

However, this is not always the case. Sometimes, the slowness of iPhone or iPad might not be fixed by waiting and many users have reported major lagging after an iOS 15 update. The problem can be caused by incompatible apps, system conflicts, inadequate device's storage space, and more.

If your iPhone is slow after iOS 15 update, keep reading and try to fix the sluggish iPhone effortlessly.

One-Click to Fix iPhone Running Slow withtout Data Loss

Actually, this kind of iPhone running slow issue is always the result of software errors after iOS 15 upgrade. The device will not respond in time for this issue. Luckily, FoneGeek iOS System Recovery is designed to get any iOS devices with issues to normal. This program is currently the preferred choice of millions of users. Read the features below to have the in-depth knowledge of FoneGeek iOS System Recovery.

FoneGeek iOS System Recovery: Fix Any iOS System Issues

  • Any iOS device with various issues such as iPhone is stuck in Recovery mode, DFU mode, Apple logo, iPhone not sharing wifi password, frozon issues, etc. can be fixed with the fasted speed and highest success rate.
  • Any iTunes errors including iTunes error 9, 3194, 54, etc. could also be resolved in one click.
  • It is 100% safe to use this tool. No data will get lost after the fixing process.
  • It works well with all iOS versions and iPhone models, including the newest iOS 15 and iPhone 12/12 mini/12 Pro (Max).

   

Steps to Fix iPhone Running Slow after iOS 15 Update with FoneGeek iOS System Recovery

Step 1. Launch this program after downloading it on your computer. Afterwards, choose the "Standard Mode" to continue.

choose repair mode

Step 2. Connect your iPhone to the computer using USB cable and the program will detect the device immediately.

connect ios device

Then you need to choose the corresponding firmware package and click on "Download".

download firmware

Step 3. After the firmware package is downloaded, click on "Fix Now" and the program will start to fix the slowing bug for your iPhone.

fix now

More Tips to Fix the Sluggish iPhone after iOS 15 Update

If your iPhone is running slower than usual after updating to iOS 15, try the following tips:

Force Reboot Your iPhone

Force restart iPhone is an easy way to fix most of the iOS issues you met. Once force restart the device, it may perform better than before.

  • For iPhone 8 or later, press and quickly release the volume up button, then do the same with the volume down button. After that, hold down the power button until you see the Apple logo.

  • For iPhone 7 or 7 Plus, press and hold the volume down button and the side button at the same time until the apple logo appears.

  • For iPhone 6s or earlier, press and hold the home button together with the power button until the Apple logo shows up on the screen.

force restart iphone

Update Your Apps

Sometimes, the installed apps on iPhone with old versions will affect the iPhone performance, as these apps may not be compatible with the new released iOS 15 version. Thus, update the versions of all apps is an urgent mission to us.

It only takes a few seconds for that. Go to Apple Store and click the option of "Update All". After that, all the apps will be updated to the newest version.

update app version

Delete Unnecessary Apps and App Caches

After installing an app on iPhone, the app cache and the app data will be saved on your iPhone when you are using this application. However, the more frequently you use the app, the larger size of the app data will be stored, which may result in iPhone running slow.

In this case, we suggest you to delete the apps you no longer need any more. For the apps you used every day, clear the caches will definitely improve your iPhone performance.

  1. Head over to Settings on your iPhone, click General and then iPhone Storage.

  2. Find the application that occupy a large space them click the apps and delete the cache.

Clean Up Your iPhone Storage

Usually, your iPhone must have at least 1GB of free storage to perform normally. If your iPhone is running slower than usaul, you'd better check it's memory space and if necessay, delete some useless files to free up some space.

To check your iPhone's storage, go to Settings > General > Storage > Manage Storage. Delete anything like old messages, videos, photos and other files that you don't need. Then your iPhone should run smoothly again.

check iphone storage

Turn Off Siri Suggestions and Siri Loop Up

The issue of iPhone running slow after iOS update could also be fixed by turning off the feature of Siri Suggestions and Siri Look Up. This feature can always prevent the iPhone from using the full potential. Therefore, disable this feature can help to speed up the device. Try the steps below:

  1. Go to Settings on your iPhone and scroll down to click "Siri & Search".

  2. Then turn off the 2 features of "Suggestions in Search" and "Suggestions in Look Up".

turn off siri suggestion

Disable Resource-Hogging Features

If Background App Refresh feature is turned on, the application content on iPhone will be refreshed automatically when the device is connected with WiFi or cellular data, which may ultimately affect the iPhone performance and make it running slow. Thus it will be necessary to disable this feature from Settings.

Run Settings app from the home screen, then click General to turn off "Background App Refresh" feature.

background app refresh

Other resource-hogging features like location services might also slow your iPhone. So you can head to Settings > Privacy > Location Services to disable it.

Install Any Update If Available

Apple often release subsequent iOS updates to introduce a number of bug fixes and performance improvements. If your iPhone started to slow down after upgrading to iOS 15, install any new update available for your device.

To do it, head to Settings > General > Software Update and tap on "Download and Install" is any new update is available.

update ios version

Factory Reset Your iPhone (Not Recommended)

Here is the last choice you can try if the above solutions didn't work and your iPhone is still running very slow. However, factory reset your iPhone is not that recommended, as this action will erase all the settings and data stored on your iPhone. If you have no other choices but reset your iPhone, then use iTunes or iCloud to back up the iPhone data first to avoid data loss.

To factory reset iPhone, go to Settings > General > Reset and select "Erase All Content and Settings". Then you will be prompted to enter the passcode to factory reset your iPhone.

erase all content and settings

The Bottom Line

Above are almost all the solutions you can use to fix your iPhone running slow after iOS 15 update. You can go through these methods one by one to get this issue fixed. To save your time, FoneGeek iOS System Recovery can be used to fix this issue with the fastest speed and highest recovery rate.

Edwin J. Parke
Tuesday on Apr 02, 2019, 11:12:47 GMT / Post By Edwin J. Parke to iPhone Issues

As a professional writer who is interested in technology, Edwin J. Parke has helped thousands of users by offering various tips to solve their problems.

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