iPhone 15 Slow?Top Simple Ways to Fix it Running Slow

By Andy Samuel to iPhone 15 | 2023-09-20

If you use your iPhone 15 for work, play, or communication, this may have an impact on your user experience and productivity.

  Fortunately, there are a few quick Fix iPhone 15 Running Slow due to its slow performance. This article will explain why your iPhone 15 is performing slowly and offer 17 quick fixes.

Part 1. Before Fix: Why is My iPhone 15 Running Slow?

There may be several reasons why is my iPhone 15 running slow all of a sudden.

  • If your iPhone is slow, it may be due to short battery life, low storage space, or the fact that you're using older software and apps.
  • Along with accumulating junk files, losing efficiency, and losing hardware efficiency with time, iPhones also become slower.
  • If you're using out-of-date apps and software, your iPhone 15 can operate slowly.

Part 2. [Detailed] 17 Ways to Fix Your iPhone 15 Running Slow Issue

17 simple and effective methods can be used how to fix iPhone 15 running slow. Try these methods one by one until you find the one that works best for you.

1.Disable Background App Refresh

This function enables background content refresh for apps, which might use up system resources and cause your iPhone to lag. By turning it off, you save battery life and ease the burden on your device's resources, enabling your iPhone to function more quickly and smoothly.

Step 1: Open iPhone Settings and select General.

Step 2: Select Background App Refresh.

Background App Refresh to run iPhone 15 faster

2. Install App Updates

Your apps' performance can be enhanced by updating them, which also solves any issues that may be slowing them down. They might not work with the newest version of iOS. Install any app updates that are available by checking the App Store.

Step 1: Launch the App Store application.

Step 2: Tap the icon for your profile in the top-right area. In the top right corner, tap your profile symbol.

Step 3: To update only one app, select Update next to it, or to update all apps, select Update All.

Update All

3. Delete Problematic or Unnecessary Apps

You may also have certain apps that you no longer or rarely use, which could take up storage space and negatively impact the performance of your iPhone 15. By deleting these programs, you may free up storage without risking their interference with the functionality of your device.

To delete an app, press and hold its icon on the home screen until the icons start jiggling, then tap the X button on the app you want to delete.

Update All

4. Enable Reduce Motion

Reduce motion is a function that reduces animation and motion effects on your iPhone 15 such as the zooming effect while opening and closing apps, the parallax effect of icons and alerts, etc. These impacts can drain your iPhone 15's battery and memory and slow it down.

Step 1: Start your iOS device's Settings app.

Step 2: Access the menu for accessibility.

Step 3: Navigate to the Motion section and select it.

Step 4: Turn on the Reduce Motion switch.

Accessibility Reduce Motion

5. Force Restart Your iPhone

Your iPhone 15's cache and RAM can be cleared with a force restart, which can fix certain small issues and speed up your iPhone. Depending on the model of your iPhone, there are different ways to force restart it. Follow these steps to Fix iPhone 15 Running Slow

Step 1: Press the Volume Up button for a long time before quickly releasing it.

Step 2: Quickly press and release the Volume Down button.

Step 3: Continue holding down the Side button until you see the Apple logo.

Step 4: Your iPhone will begin the restart procedure when the Apple logo appears.

6. Clear history and caches

Caches and your browsing history might eat up space on your iPhone 15 and slow it down. Clearing this data not only makes space available, but also makes sure that your Safari browser functions properly, which makes browsing faster.

Go to Settings > Safari and select Clear History and Website Data to delete them.

Clear history and webisite data

7. Clean Up Your iPhone Storage

If your iPhone 15 has little storage, it might operate slowly. When your iPhone 15 is nearly full, iOS slows down your device because it lacks sufficient room to function. Remove useless documents, images, videos, and apps that you don't use anymore.

You can also offload unused apps automatically by going to Settings > General > iPhone Storage > Offload Unused Apps.

Clear history and webisite data

8. Enable Reduce Transparency

On your iPhone 15, you may use a feature called "Reduce Transparency" to lessen the transparency and blur effects in places like the dock, folders, the control centre, etc. These impacts can drain your iPhone 15's battery and memory and slow it down.

To enable reduced transparency, go to Settings > Accessibility > Display & Text Size and turn on Reduce Transparency.

Reduce Transparency

9. Disable Location Services

Apps can access your location data using location services, which might reduce battery life and performance. Even when you are not using some apps, they may still consume your location data, which will slow down your iPhone 15.

Go to Settings > Privacy > Location Services and turn off location services for all applications or just the ones you don't need to use your location data for.

Disable Location Services

10. Remove Widgets from Home Screen

On your home screen, widgets—mini apps—display information like the weather, the news, the calendar, etc. They may drain your iPhone 15's power and memory, slowing down the operation. Follow these steps to fix iPhone 15 lagging.

Step 1: Swipe from left to right on your home screen until you reach the widgets page.

Step 2: At the bottom of the screen, tap on the "Edit" option.

Step 3: Look for the widgets you want to remove, and you will see a minus sign (-) next to each widget. Tap on the minus sign (-) for the widgets you wish to delete.

Remove Widgets from Home Screen

11. Turn off Unwanted Notification

App notifications can be annoying and use up system resources. Notifications might be useful, but too many of them can disrupt your workflow and slow down your iPhone. To accomplish this, disable any unnecessary notifications.

Go to Settings > Notifications, choose the app you wish to control, and then adjust the notification settings to turn off unwanted notifications.

Remove Widgets from Home Screen

12. Turn off Low Power Mode

When your iPhone 15's battery is low, a feature called low power mode lowers the amount of power it uses. Limiting various features and operations can potentially lessen the performance of your iPhone 15.

Step 1: Launch the Settings app on your iOS 17 device.

Step 2: Navigate to the Battery menu.

Step 3: Locate the Low Power Mode toggle switch and slide it to the left to turn it off.

Turn off Low Power Mode

13. Turn Off Siri Suggestions & Siri Look Up

Siri suggestions are recommendations that appear on your lock screen, search screen, or app switcher based on your usage patterns. iPhone 15 runs slowly due to both features that drain battery and memory.

Step 1: Go to Settings > Siri & Search.

Step 2: Turn off the toggles for the suggestions that you want to disable, such as Suggestions on Lock Screen, Suggestions in Search, and Suggestions in Look Up.

Turn Off Siri Search Suggestions & Siri Look Up

14. Disable Automatic Downloads

Automatic downloads are a feature that allows your iPhone 15 to automatically download and install updates, apps, music, books, etc. from the App Store, iTunes Store, or iCloud. This can use up your storage space and bandwidth and make your iPhone 15 run slow.

Step 1: Open the Settings app Tap App Store.

Step 2: Turn off the Automatic Downloads toggle switch.

Disable Automatic Downloads

15. Disable Resource-Hogging Features

Some features on your iPhone 15 can use a lot of resources and affect its performance, such as live wallpapers, dynamic wallpapers, live photos, etc.

Go to Settings > Wallpaper and choose a still image as your wallpaper, go to Settings > Camera and turn off Live Photos, etc.

Wallpaper turn off Live Photos

16. Factory Reset Your iPhone (Not Recommended)

Your iPhone 15 can be reset to its factory default settings and all of your data by performing a factory reset. This can fix iPhone 15 running slow and resolve some serious problems, but it can also erase all of your sensitive information. As a result, it is not advised unless you have tried all other options.

Step 1: Open the Settings app and Tap General.

Step 2: Scroll down and tap Transfer or Reset iPhone Tap Erase All Content and Settings.

Step 3: Enter your passcode tap “Erase” and confirm again.

Factory Reset Your iPhone 15

17. Contact Apple Support (Hardware issue)

If none of the solutions listed above succeeds, your iPhone 15 and you're thinking why is my iPhone 15 lagging it might have a hardware problem that needs to be fixed or replaced by a specialist. To receive assistance, you can reach out to Apple support online, go to an Apple store, or go to a licensed service provider.

Part 3. What to Do if Internet is Slow on iPhone 15?

Here are some suggestions to aid you if your iPhone 15 is having issues with slow internet:

  • Restart your Wi-Fi router: Restarting your Wi-Fi router can address connectivity issues.
  • Update the firmware on your router: Doing so will allow you to address known faults and enhance performance.
  • Switch to the 5GHz band: If you have a dual-band Wi-Fi router, switching to the 5GHz band may assist.
  • Verify the Auto-Join setting: Make sure your Wi-Fi network's Auto-Join setting is on.
  • Switch off your iPhone: Temporary software issues can sometimes be fixed by restarting your iPhone.
  • Check the state of the network: Internet speed may be impacted by crowded networks or poor Wi-Fi signals.
  • Check your storage space: Inadequate storage space on your iPhone can have an influence on performance.

Part 4. Bonus: One-click to Unlock iPhone 15/14/13 Without Passcode Or Face ID [Without Apple ID]

PassFab iPhone Unlock is a user-friendly tool that can unlock iPhones without a passcode or face ID, especially for those who have forgotten their passcode or bought a second-hand iPhone locked by someone else's Apple ID. It can bypass various iPhone locks in just minutes.

  • Download the PassFab iPhone Unlock and launch it by clicking "Start" and following the next steps.

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  • To proceed, connect your iPhone or iPad to the computer running PassFab iPhone Unlock and click the "Next" button.

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  • Select the save path and click "Download" to download the firmware package. Wait a few minutes and ensure your network connection is well-prepared.

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  • To remove your passcode, click the "Start Remove" button, then open your device without it, set up a new passcode, or use Touch ID or Face ID.

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Final Words

This article provides 17 simple and effective methods to Fix iPhone 15 Running Slow performance. It covers possible reasons and offers 17 solutions. The article also teaches unlocking iPhone 15 without a passcode or face ID using PassFab iPhone Unlock . it is compatible with iOS 17 also.