iPhone Running Slow: Causes and Solutions

Last Updated on 5 February 2026

An iPhone may slow down due to a combination of factors, like a lack of free memory caused by too many active apps, large files filling up storage, or an outdated version of iOS that isn’t optimized for the device’s hardware.

So what can be done? Start with the basics: restart the iPhone, clear its memory, close unused apps, free up storage, and update iOS to the latest version. If these steps don’t help, it’s worth checking recently installed apps for errors and resetting the network settings.

Main Reasons Why an iPhone Slows Down

There are several possible causes of reduced iPhone performance, and before attempting any repairs, it’s essential to identify the real source of the problem.

Let’s look at the most common reasons your iPhone might be running slow.

iOS Update Issues

One frequent cause of lag is an error during the iOS update process. This can happen if the update file came from an unreliable source or if the installed version isn’t fully compatible with your device model.

As a result, your iPhone may freeze on the Apple logo screen, crash frequently, or load apps extremely slowly due to missing system components.

Too Many Apps Running at Once

Multitasking is convenient but resource-intensive. This is usually not an issue when several simple online casino games are open at once. However, problems can arise if you also turn on music and start downloading a movie at the same time. The more apps you have open, the less memory is available for each, which can lead to lag.

Lack of Free Space

A shortage of available storage is another common reason for slow performance.

An iPhone’s memory is divided into two main types:

• RAM (random-access memory) – used by the system and apps currently running.
• Internal storage – where personal data, photos, music, and other files are stored.
  
  

When either type of memory runs low, system processes start lagging. This is especially noticeable when viewing photos or playing videos, as these tasks require more resources.

Battery Problems

Battery health has a direct impact on performance. An iPhone may slow down when the battery charge is low or when the battery is damaged — for instance, if it’s swollen or exposed to moisture. Poor-quality chargers and prolonged charging sessions can also degrade battery health over time.

Outdated iOS Version

Using an old version of iOS can cause noticeable slowdowns, especially when trying to run new apps or features designed for newer systems. Outdated software simply can’t handle modern processes efficiently.

Automatic iCloud Backups

While iCloud backups are useful, they can temporarily slow performance. When your iPhone is connected to Wi-Fi and performing a backup, it uses considerable CPU and battery resources. During this time, you might notice delays or stuttering.

Too Many Visual Effects

Animated wallpapers and excessive motion effects can also cause the iPhone to lag. These features demand extra power from the graphics processor, leading to slower screen response and performance drops.

Poor Internet Connection

A weak or unstable network connection can disrupt app functions and cause delays when sending or receiving data. Apps may appear to freeze simply because they can’t connect properly.

Low Power Mode

Although useful for conserving battery life, Low Power Mode can reduce overall performance by limiting background activities and visual effects, making your device feel slower.

Overheating

Temperature directly affects how your iPhone operates. Exposure to extreme heat or cold can disrupt internal processes, trigger errors, or even damage components, resulting in unstable performance.

10 Ways to Speed Up Your iPhone

If your iPhone is running slow, there’s no need to rush to a service centre. Try these effective solutions first.

1. Optimize Storage

Start by freeing up disk space — the simplest and most effective fix. Delete unused apps, old photos, and videos.

Also, clear the Safari browser cache regularly, as it can store unnecessary temporary files that slow things down.

2. Check Battery Health

Battery diagnostics can reveal potential performance issues.

Look for signs such as:

• Bulging or deformed casing
• Leakage marks
• Discolouration
• Uneven heating
  
  

If any of these are present, the battery may need replacement.

3. Check Network Connection

A poor connection can make the phone feel sluggish. Before taking other steps, ensure your Wi-Fi or cellular connection is stable.

4. Manage Background Processes

Close unresponsive or idle apps regularly. This prevents them from consuming memory and processing power unnecessarily.

5. Clear RAM

Clearing random-access memory can significantly improve performance. Use utilities like CleanMyMac X (on Mac) or similar apps to remove temporary files and monitor system resources.

You can also manage storage directly from your iPhone:

• Go to Settings → General → iPhone Storage → Manage Storage
• Review apps by size and delete those you no longer use

6. Disable Low Power Mode

Low Power Mode limits system speed to conserve energy, especially when running heavy apps.

To turn it off:

• Open Settings → Battery, then disable Low Power Mode,
   or
• Swipe down from the top-right corner and tap the battery icon in the Control Centre.

7. Reduce Animations

To ease GPU load, replace animated wallpapers with static ones.

Navigate to Settings → Wallpaper → Choose a New Wallpaper and select a still image instead.

8. Prevent Overheating

Keep your device away from direct sunlight and extreme temperatures. Heat can slow down the processor and even cause permanent hardware damage.

9. Reset Settings and Data

If none of the above helps, restoring factory settings can solve deeper software issues. This process deletes all data and resets all configurations.

Important: Create a full backup of your data before performing a reset, as it cannot be undone.

10. Perform a Factory Reset

A full factory reset should be your last resort. Afterward, your iPhone will perform like new, but you’ll need to set up everything again manually.

What to Do If Your iPhone Slows Down After an Update

Many users noticed performance drops after upgrading to iOS 18, but there are ways to fix this without replacing your device.

Optimize Storage

The latest iOS versions need more free space to function properly.

Go to Settings → General → iPhone Storage to check memory status. Remove unused apps, clear caches, and delete old files.

Restart or Reset Your iPhone

Restarting your iPhone helps free up memory and can temporarily fix slowdowns.

If that doesn’t help, reset all settings via Settings → General → Transfer or Reset iPhone → Reset All Settings.

Perform a Force Restart

A force restart can help fix serious system freezes. The method depends on your iPhone model:

• iPhone 8 and newer: Quickly press and release Volume Up, then Volume Down, and hold the Power button until the Apple logo appears.
• iPhone 7 / 7 Plus: Hold down Power and Volume Down together until the Apple logo appears.
• iPhone 6s and older: Hold Power and Home buttons simultaneously until the Apple logo appears.

These steps will help you restore your iPhone’s speed and keep it running smoothly without costly repairs or replacements.