How to Fix a Slow Windows 11 PC, 15 Proven Ways

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How to Fix a Slow Windows 11 PC, 15 Proven Ways

How to fix a slow Windows 11 PC using Windows performance troubleshooting

Is your Windows 11 PC running slow? You can often fix the problem without replacing your computer. In this guide, you will learn how to fix a slow Windows 11 PC by checking startup apps, storage space, memory, CPU usage, Windows updates, system files, and other common causes.

A Windows 11 computer can become slow for many reasons. Too many startup apps, low storage space, outdated drivers, background programs, high memory usage, malware, damaged system files, and aging hardware can all affect performance.

The good news is that many Windows 11 performance problems can be fixed using built-in Windows tools. Start with the simple checks first, then move to the more advanced troubleshooting steps.

Quick Answer: To fix a slow Windows 11 PC, first check Task Manager for high CPU, memory, or disk usage. Then disable unnecessary startup apps, free up storage space, install Windows updates, remove unused programs, scan for malware, and repair damaged Windows system files.

Table of Contents

1. Check What Is Making Windows 11 Slow

Before changing Windows settings, find out what is using your computer's resources. Windows 11 includes Task Manager for this purpose.

Open Task Manager

  1. Press Ctrl + Shift + Esc.
  2. Select Processes.
  3. Look at the CPU, Memory, and Disk columns.
  4. Wait for several seconds and watch the values.

If CPU, memory, or disk usage remains very high, look for the application or process responsible.

For example, CPU usage close to 100 percent can make applications respond slowly. Memory usage close to 100 percent can cause Windows to rely more heavily on the storage drive.

Do not end Windows system processes unless you know what they do.

Windows 11 Task Manager showing CPU memory and disk usage

2. Restart Your Computer

A restart is one of the simplest ways to fix temporary Windows performance problems.

Background processes can remain active while your computer is running. A restart closes these processes and starts Windows again.

  1. Select Start.
  2. Select Power.
  3. Select Restart.
  4. Wait for Windows to start again.

After restarting, check whether your PC is faster.

3. Disable Unnecessary Startup Apps

Startup applications automatically run when you sign in to Windows. Too many startup apps can increase startup time and continue using system resources after Windows loads.

Disable Startup Apps from Settings

  1. Open Settings.
  2. Select Apps.
  3. Select Startup.
  4. Find applications that you do not need to start automatically.
  5. Turn them Off.

Disable Startup Apps with Task Manager

  1. Press Ctrl + Shift + Esc.
  2. Select Startup apps.
  3. Select an unnecessary application.
  4. Select Disable.

Do not disable security software or hardware-related software unless you understand its purpose.

.Windows 11 Startup apps settings showing applications that can be disabled

4. Close Programs and Browser Tabs You Do Not Need

Running many programs at the same time can consume memory and CPU resources.

Web browsers can also use a large amount of memory when many tabs are open.

  • Close unused programs.
  • Close browser tabs you no longer need.
  • Close unnecessary browser windows.
  • Check Task Manager again.
  • See whether memory or CPU usage has decreased.

If the computer becomes faster after closing applications, limited memory or excessive background activity may be contributing to the problem.

5. Free Up Storage Space

A nearly full Windows drive can cause storage-related problems and make it harder for Windows to install updates.

Check your available storage:

  1. Open File Explorer.
  2. Select This PC.
  3. Check the available space on your Windows drive.

Review these locations for files you no longer need:

  • Downloads.
  • Temporary files.
  • Recycle Bin.
  • Old installers.
  • Large videos.
  • Unused applications.
  • Old files stored on the desktop.

Be careful when deleting files. Do not remove Windows system files unless you know they are safe to delete.

For more information, see how to remove junk files from your computer.

.Windows 11 Storage settings showing available disk space

6. Turn On Storage Sense

Windows 11 includes Storage Sense, which can automatically remove some unnecessary temporary files.

  1. Open Settings.
  2. Select System.
  3. Select Storage.
  4. Select Storage Sense.
  5. Turn on Storage Sense.

You can also open Cleanup recommendations and review the suggested files before removing them.

Review files before deleting them. Do not remove important personal files simply because they are large.

7. Remove Unnecessary Programs

Unused programs take up storage, and some applications may continue running background processes.

  1. Open Settings.
  2. Select Apps.
  3. Select Installed apps.
  4. Find a program you no longer need.
  5. Select the three-dot menu.
  6. Select Uninstall.
  7. Follow the instructions.

Remove applications you recognize and no longer use. Avoid uninstalling drivers, hardware utilities, or Windows components unless you know what they do.

8. Install Windows 11 Updates

Windows updates include security fixes, bug fixes, compatibility improvements, and other changes that can help keep your system working correctly.

  1. Open Settings.
  2. Select Windows Update.
  3. Select Check for updates.
  4. Install available updates.
  5. Restart your PC if Windows asks you to.
Windows 11 Windows Update page showing the Check for updates button

9. Update Important Drivers

Outdated or problematic drivers can sometimes cause performance or stability problems.

Pay particular attention to:

  • Graphics drivers.
  • Chipset drivers.
  • Storage drivers.
  • Network drivers.

Use Windows Update first. You can also check your computer manufacturer's official support website for drivers designed for your exact model.

Avoid downloading drivers from unknown websites.

10. Check CPU, Memory, and Disk Usage

If your PC remains slow, open Task Manager again by pressing Ctrl + Shift + Esc.

CPU Usage

If CPU usage remains very high while you are doing simple tasks, identify the process using the most CPU.

Memory Usage

If memory usage is consistently very high, your computer may not have enough RAM for your normal workload.

See our guide on how to fix low memory on a Windows PC for additional troubleshooting.

Disk Usage

If disk usage stays very high, check which process is responsible.

If you regularly see 100 percent disk usage, our guide to fixing 100 percent disk usage may help.

11. Scan Windows 11 for Malware

Malware can slow down a computer and consume CPU, memory, disk space, or network resources.

Windows 11 includes Windows Security.

  1. Open Start.
  2. Search for Windows Security.
  3. Open Windows Security.
  4. Select Virus & threat protection.
  5. Select Quick scan.

If you suspect a more serious infection, use the additional scanning options available in Windows Security.

Do not install several antivirus programs at the same time unless you understand how they will interact.

12. Reduce Unnecessary Background Activity

Some applications continue working in the background when you are not actively using them.

Review your installed applications and remove programs you do not need.

For applications that provide background permission controls, review their settings and limit unnecessary activity.

This can reduce the number of processes running while you work.

13. Adjust Windows Visual Effects

Windows 11 uses visual effects such as animations and transparency. These effects normally work well on modern hardware. Reducing them can help older computers with limited resources.

Adjust Visual Effects

  1. Press Windows + R.
  2. Type sysdm.cpl.
  3. Press Enter.
  4. Select the Advanced tab.
  5. Under Performance, select Settings.
  6. Select Adjust for best performance.

You can also select individual effects instead of disabling everything.

.Windows 11 Performance Options showing visual effects settings

14. Repair Corrupted Windows System Files

Damaged Windows system files can cause unusual behavior and performance problems.

Windows includes two useful command-line tools, DISM and System File Checker.

Run DISM

  1. Open Start.
  2. Search for Command Prompt.
  3. Right-click Command Prompt.
  4. Select Run as administrator.
  5. Enter this command:
DISM.exe /Online /Cleanup-image /Restorehealth

Press Enter and wait for the operation to finish.

Run System File Checker

After DISM finishes, run:

sfc /scannow

Wait until the scan reaches 100 percent.

Restart the computer after the repairs are complete.

If you want more detailed instructions, see how to fix corrupted files in Windows 11 and Windows 10.

Windows 11 Command Prompt running DISM and SFC system repair commands

15. Check Your Hard Drive or SSD

Storage hardware can also affect computer performance.

Watch for these warning signs:

  • Frequent freezing.
  • File errors.
  • Very slow file transfers.
  • Unusual clicking sounds from an HDD.
  • Applications taking a long time to open.
  • Repeated disk errors.

If you have an older HDD, upgrading to an SSD can provide a major improvement in everyday responsiveness.

Before replacing or repairing a drive, back up important files.

You can also read our guide on hard drive repair and troubleshooting.

16. Check Whether Your Hardware Is Limiting Performance

Sometimes Windows is not the main problem. Your computer may simply have limited hardware for the applications you are using.

Check:

  • RAM capacity.
  • CPU model.
  • GPU model.
  • Storage type.
  • Available storage.
  • Age and condition of the computer.

For example, a computer with limited RAM may slow down when you open many applications and browser tabs.

An older HDD can also make Windows feel much slower than a modern SSD.

You can check your hardware and Windows configuration with our guide on how to check system information in Windows.

17. Use a Clean Boot to Find Software Conflicts

If Windows 11 becomes slow after installing a particular program, driver, or update, a software conflict may be involved.

A clean boot starts Windows with a minimal set of drivers and startup programs. This can help identify software conflicts.

This is a more advanced troubleshooting step, so beginners should make changes carefully.

If the PC works normally after a clean boot, gradually enable startup services and applications until you identify the program causing the problem.

If you need Safe Mode for additional troubleshooting, see our guide on how to boot Windows 10 and Windows 11 in Safe Mode.

18. What to Do If Windows 11 Is Still Slow

Windows Is Slow Immediately After Startup

  • Check startup applications.
  • Check background applications.
  • Check Windows updates.
  • Check disk usage.
  • Check available storage.

Windows Becomes Slow After Opening Many Programs

  • Check memory usage.
  • Check the number of browser tabs.
  • Check CPU usage.
  • Check available RAM.

Windows Freezes While Opening Files

  • Check disk usage.
  • Check storage health.
  • Check file system errors.
  • Check available storage.

Windows Is Slow After Installing a Program

  • Check startup applications.
  • Check background processes.
  • Check recently installed software.
  • Check driver compatibility.

The PC Is Slow All the Time

  • Check CPU usage.
  • Check memory usage.
  • Check disk usage.
  • Scan for malware.
  • Repair system files.
  • Check storage hardware.
  • Check hardware limitations.

If software troubleshooting does not solve the problem, older hardware may be the limiting factor.

19. Quick Checklist to Speed Up Windows 11

  1. Restart the PC.
  2. Check Task Manager.
  3. Disable unnecessary startup apps.
  4. Close unused applications.
  5. Close unnecessary browser tabs.
  6. Free up storage space.
  7. Turn on Storage Sense.
  8. Uninstall programs you do not use.
  9. Install Windows updates.
  10. Update important drivers.
  11. Scan for malware.
  12. Reduce unnecessary background activity.
  13. Reduce visual effects on older hardware.
  14. Run DISM and SFC.
  15. Check the health and age of your storage device and other hardware.

20. Frequently Asked Questions

Why is my Windows 11 PC suddenly slow?

A sudden slowdown can be caused by a background process, Windows update, application, malware, high disk usage, or another temporary problem. Open Task Manager first and check CPU, memory, and disk usage.

How do I make Windows 11 faster?

Start by disabling unnecessary startup apps, freeing storage space, installing Windows updates, removing unused programs, checking Task Manager, and scanning for malware.

Does low storage make Windows 11 slow?

Low free storage can contribute to Windows performance and update problems. Freeing unnecessary files can help maintain enough working space.

Does more RAM make Windows 11 faster?

More RAM can improve performance when your current memory is regularly close to full. It is especially useful when you frequently run many applications or browser tabs.

Does an SSD make Windows 11 faster?

An SSD can improve boot times, application loading, file access, and general system responsiveness compared with an older mechanical hard drive.

Should I disable all startup apps?

No. Disable unnecessary applications, but keep important security, hardware, and system-related software enabled unless you know what the application does.

Can Windows system files cause slow performance?

Damaged system files can contribute to Windows problems. DISM and SFC can help repair Windows components and system files.

When should I upgrade my computer?

Consider a hardware upgrade when software troubleshooting does not solve the problem and your CPU, RAM, or storage device is no longer suitable for your everyday workload.

Final Thoughts

A slow Windows 11 PC does not always mean that you need a new computer.

Start by identifying the problem with Task Manager. Then check startup applications, storage space, background programs, Windows updates, malware, and system files.

If software troubleshooting does not solve the problem, check your RAM, storage device, CPU, and other hardware.

For older computers, an SSD or RAM upgrade can sometimes provide a bigger performance improvement than changing Windows settings.

Work through the fixes one at a time. After each major change, test the computer again. This makes it easier to identify the change that actually improved performance.

Computerdok Tip: Do not make many system changes at the same time. Test your PC after each major change so you can identify what solved the problem.
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