How to Speed Up a Slow Windows PC: 15 Fixes

byKona -
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Last updated: August 12, 2026

A slow Windows PC can make simple tasks frustrating. Programs may take longer to open, websites can load slowly, and Windows may take several minutes to start. Common causes include low free storage, too many startup apps, malware, insufficient RAM, overheating, an aging hard drive, or software problems.

This guide shows you how to speed up a slow Windows PC with 15 practical fixes. Start with the easiest software-based solutions and work toward hardware upgrades if needed.

Important: Windows 10 reached the end of regular support on October 14, 2025. If you still use Windows 10, consider upgrading to Windows 11 when your hardware supports it. Windows 10 PCs can continue to work, but regular security support has ended for standard editions.

How to speed up a slow Windows PC using Task Manager and Windows settings

Quick Answer: How to Speed Up a Slow PC

If you only have a few minutes, start with these steps:

  1. Check Task Manager to find what is using your CPU, memory, or disk.
  2. Free up storage space with Storage Sense or Disk Cleanup.
  3. Disable unnecessary startup apps.
  4. Run a malware scan with Windows Security.
  5. Restart Windows and install available updates.

If your PC is still slow, continue with the remaining fixes below.

Table of Contents

1. Check What Is Making Your PC Slow

Windows 11 Task Manager showing CPU memory and disk usage

Before changing settings, find out what is actually causing the slowdown. Windows Task Manager can show whether your processor, memory, disk, or network is under heavy load.
  1. Press Ctrl + Shift + Esc to open Task Manager.
  2. Select Processes.
  3. Click the CPU, Memory, or Disk column to sort processes by usage.
  4. Look for a program that consistently uses an unusually large amount of system resources.

Then select Performance to see detailed CPU, memory, disk, and network information.

If you want to identify your computer's hardware and Windows configuration, see our guide on how to check system information in Windows.

If disk usage stays near 100 percent, see our guide on how to fix 100% disk usage in Windows.

2. Free Up Disk Space

Windows 11 Storage Sense and available disk space

A nearly full Windows drive can cause performance and update problems. Windows needs available storage for temporary files, updates, applications, and other system operations.

Start by checking how much space is available:

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

Remove files you no longer need, uninstall unused programs, and move large videos, photos, and other personal files to external storage or cloud storage.

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

Use Storage Sense

Storage Sense can automatically remove temporary files and other unnecessary items. It is available in both Windows 10 and Windows 11.

  1. Open Settings.
  2. Go to System > Storage.
  3. Turn on Storage Sense.
  4. Select Storage Sense or Configure Storage Sense to review its settings.

Windows 11 also provides Cleanup recommendations, which can help identify temporary files, large or unused files, and unused apps.

3. Remove Temporary and Unnecessary Files

Disk Cleanup can remove temporary files and certain system files, especially on older Windows installations.

  1. Type Disk Cleanup into Windows Search.
  2. Open Disk Cleanup.
  3. Select your Windows drive, usually C:.
  4. Select the types of files you want to remove.
  5. Select OK, then Delete Files.

You can select Clean up system files for additional cleanup options.

Review the list before deleting files. Some system files, such as previous Windows installation files, may be useful if you need to roll back an upgrade.

4. Uninstall Programs You Do Not Need

Unused applications consume storage and some may run background processes or services.

  1. Open Settings.
  2. In Windows 11, go to Apps > Installed apps.
  3. In Windows 10, go to Apps > Apps & features.
  4. Find programs you no longer use.
  5. Select the program and choose Uninstall.

Do not uninstall drivers, Microsoft system components, or manufacturer utilities unless you know what they do.

5. Disable Unnecessary Startup Apps

Windows 11 Task Manager Startup Apps showing startup impact

Too many startup programs can make Windows take longer to boot and can keep running in the background after startup.
  1. Press Ctrl + Shift + Esc to open Task Manager.
  2. Select Startup apps.
  3. Review the programs listed.
  4. Check the Startup impact column.
  5. Right-click an unnecessary program and select Disable.

Disabling a startup app does not uninstall it. You can still launch the program manually whenever you need it.

Do not disable security software, hardware utilities, or other startup items unless you understand their purpose.

6. Install Windows and Driver Updates

Updates can fix bugs, improve compatibility, and address performance problems. Before troubleshooting further, make sure Windows is fully updated.

  1. Open Settings.
  2. Select Windows Update.
  3. Select Check for updates.
  4. Install available updates and restart the PC when required.

You can also check Advanced options > Optional updates for available driver updates.

For graphics drivers, chipset drivers, and other important hardware drivers, the manufacturer's official support page may provide newer versions than Windows Update.

7. Check for Malware

Windows Security Virus and threat protection scan in Windows 11

Malware can consume processor, memory, disk, and network resources. It can also cause crashes, freezes, unwanted pop-ups, and other performance problems.

Windows includes Windows Security with Microsoft Defender Antivirus.

  1. Open Windows Security.
  2. Select Virus & threat protection.
  3. Select Quick scan.
  4. Follow the instructions if a threat is detected.

If you suspect a serious infection, use the available advanced scanning options in Windows Security rather than relying only on a quick scan.

8. Check Your Drive for Errors

File system problems can cause crashes, slow file access, and other errors. If your drive is showing unusual behavior, check it for errors.

  1. Open File Explorer.
  2. Right-click your Windows drive, usually C:.
  3. Select Properties.
  4. Open the Tools tab.
  5. Under Error checking, select Check.

You can also use CHKDSK from an elevated Windows Terminal:

chkdsk C: /f

The /f option tells CHKDSK to fix file system errors. Windows may tell you that the drive is currently in use and schedule the check for the next restart.

Back up important files before performing drive repairs, especially if you suspect the physical drive is failing.

If Task Manager shows disk usage near 100 percent, see how to fix 100% disk usage in Windows.

9. Optimize Your Storage Drive

Windows automatically manages drive optimization, but you can check the status manually.

  1. Type defragment into Windows Search.
  2. Open Defragment and Optimize Drives.
  3. Select the drive you want to check.
  4. Select Optimize.

Traditional mechanical hard drives can benefit from defragmentation. SSDs use different optimization methods, including TRIM. Do not manually treat an SSD like a traditional HDD.

Windows normally schedules drive optimization automatically, so most users do not need to run it manually on a regular basis.

10. Add More RAM

If your PC becomes slow when you open many browser tabs or several applications, insufficient RAM may be the problem.

When physical memory is heavily used, Windows may rely more heavily on the page file on your storage drive. This is much slower than working directly with RAM.

Check your current memory usage in Task Manager > Performance > Memory.

If your computer regularly runs out of memory, consider adding RAM if your hardware supports an upgrade. Some laptops have soldered memory and cannot be upgraded.

Check your computer manufacturer's specifications before buying RAM.

If Windows reports low memory, see how to fix low memory problems in Windows for additional solutions.

11. Upgrade From an HDD to an SSD

Upgrading a Windows PC from an HDD to an SSD
If your computer still uses a traditional mechanical hard drive, upgrading to an SSD can make a major difference in everyday performance.

An SSD can significantly reduce Windows startup times and improve application loading and file access compared with an older HDD.

Before buying an SSD, check whether your computer uses a 2.5-inch SATA drive, M.2 SATA drive, or M.2 NVMe drive. Laptop and desktop compatibility varies.

You can either clone your existing Windows installation or perform a clean Windows installation on the new drive.

If your PC already has an SSD, upgrading to another SSD may provide less noticeable improvement than adding RAM, replacing an aging drive, or fixing a software-related bottleneck.

12. Reduce Unnecessary Visual Effects

Windows visual effects use system resources. On older or low-powered computers, reducing these effects can make the interface feel more responsive.

  1. Type performance into Windows Search.
  2. Select Adjust the appearance and performance of Windows.
  3. Open the Visual Effects tab.
  4. Select Adjust for best performance.
  5. Select Apply, then OK.

You can also select Custom and keep the visual effects you prefer.

13. Clean Up Your Web Browser

If Windows itself feels normal but Chrome or Edge is slow, the problem may be related to browser extensions, cached data, or excessive open tabs.

Start by closing tabs you no longer need and disabling extensions you do not use.

Microsoft Edge:

  1. Open Edge and select the three dots.
  2. Select Settings.
  3. Go to Privacy, search, and services.
  4. Find the option for clearing browsing data.
  5. Choose the data you want to remove.

Google Chrome:

  1. Open Chrome and select the three dots.
  2. Select Settings.
  3. Open Privacy and security.
  4. Select Delete browsing data.
  5. Choose the data you want to clear.

Clearing the cache can help with some browser problems, but it is not a general Windows performance fix. If Chrome freezes or becomes unresponsive, see how to fix Google Chrome not responding.

14. Check Power and Performance Settings

Power settings can affect processor performance, particularly on laptops.

In Windows 11, you can check the power mode from:

  1. Open Settings.
  2. Select System > Power & battery.
  3. Open Power mode.
  4. Select the performance option appropriate for your situation.

On a laptop, higher performance can increase power consumption and heat. If the computer is already overheating, changing to a higher-performance mode may make the problem worse.

For desktops, performance problems are more often caused by hardware, software, storage, drivers, or overheating than by the power mode.

15. Clean Your PC and Check for Overheating

Cleaning dust from a PC fan and heatsink to prevent overheating


Heat can cause a computer to reduce CPU and GPU performance to protect the hardware. Dust-covered vents, blocked fans, and poor airflow can contribute to overheating.

Signs of overheating include:

  • Fans running loudly for long periods.
  • The computer becoming unusually hot.
  • Performance dropping during demanding tasks.
  • Unexpected shutdowns or restarts.

Turn off the computer and disconnect it from power before cleaning it.

Use compressed air to remove dust from vents and fans. Do not block the ventilation openings while the computer is running.

For desktops, clean the internal fans, heatsinks, and air filters if you are comfortable opening the case.

If your laptop becomes hot or the fan runs constantly, see our guide on how to stop laptop overheating and fan noise.

Use Safe Mode to Find Software Problems

If your PC becomes slow after installing a program, driver, or other software, Safe Mode can help determine whether a third-party component is responsible.

  1. Open Settings > System > Recovery.
  2. Under Advanced startup, select Restart now.
  3. After Windows restarts, select Troubleshoot > Advanced options > Startup Settings.
  4. Select Restart.
  5. Press 4 to start Safe Mode or 5 for Safe Mode with Networking.

You can then test whether the performance problem still occurs. If Windows runs normally in Safe Mode, a startup application, driver, or third-party service may be contributing to the problem.

For additional methods, see how to boot Windows in Safe Mode.

What to Do If Your PC Is Still Slow

If none of the fixes above solves the problem, use Task Manager to identify the bottleneck again.

  • CPU near 100%: Find the process using the most CPU and investigate that application.
  • Memory near 100%: Close unnecessary programs or consider adding RAM.
  • Disk near 100%: Check for Windows processes, background applications, drive errors, or an aging HDD.
  • Normal CPU, memory, and disk usage: Check for driver problems, software conflicts, overheating, or hardware limitations.

Try a Clean Boot

A clean boot starts Windows with only essential drivers and startup services. It can help identify whether a third-party service or startup program is causing the slowdown.

Use this method when normal Windows operation is slow but you cannot identify the cause through Task Manager.

Consider Resetting Windows

If software problems continue after troubleshooting, Reset this PC can reinstall Windows and give you a fresh start.

Back up important files before resetting Windows. If BitLocker encryption is enabled, make sure you have access to your recovery key before starting the reset.

In Windows 11, you can access the feature through Settings > System > Recovery > Reset this PC.

Frequently Asked Questions

Why is my Windows PC suddenly so slow?

A sudden slowdown can be caused by a background process, Windows update, malware, failing storage, insufficient memory, overheating, or a newly installed program or driver. Open Task Manager first to see which resource is being heavily used.

How can I speed up a slow Windows PC for free?

Start by freeing up storage space, disabling unnecessary startup apps, uninstalling unused software, installing available updates, scanning for malware, reducing unnecessary visual effects, and checking for overheating.

Does freeing up disk space make a computer faster?

It can help, especially when the Windows drive is nearly full. Windows needs available storage for temporary files and updates. Freeing space can also prevent storage-related performance and update problems.

Should I defragment an SSD?

You should not manually defragment an SSD like a traditional hard drive. Windows manages SSD optimization automatically using methods appropriate for solid-state storage.

How much RAM does Windows 11 need?

Microsoft lists 4 GB of RAM as the minimum system requirement for Windows 11, but 8 GB or more is a more practical amount for everyday multitasking. If you regularly use many browser tabs or demanding applications, more RAM may provide a noticeable improvement.

Is it safe to disable startup programs?

Yes, disabling a startup app prevents it from launching automatically. It does not uninstall the program. However, avoid disabling security software or hardware-related utilities unless you know what they do.

Can dust make a computer slow?

Yes. Dust can restrict airflow and contribute to overheating. When components become too hot, the computer may reduce performance to control temperatures.

Will upgrading from an HDD to an SSD make my PC faster?

Usually, yes. An SSD can significantly improve Windows startup, application loading, file access, and general system responsiveness compared with an older mechanical HDD.

Should I reset Windows if my computer is slow?

Resetting Windows should be a later troubleshooting step, not the first solution. Try diagnosing the cause first. If software problems remain, Reset this PC can reinstall Windows. Back up your important files before using it.

Final Thoughts

Most slow Windows PC problems have a specific cause. The best approach is to diagnose the problem before making major changes.

Start with Task Manager, free up storage, remove unnecessary startup programs, install updates, and scan for malware. If the PC still struggles, investigate RAM, storage, drivers, overheating, and hardware limitations.

If your computer still uses an old mechanical hard drive, an SSD upgrade can provide one of the biggest improvements in everyday responsiveness. If the hardware is otherwise capable, you may be able to restore good performance without replacing the entire computer.

For Windows 10 users, remember that standard Windows 10 support ended on October 14, 2025. If your PC supports Windows 11, upgrading is the better long-term option.

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