How to Speed Up a Slow Windows PC: A Safe Step-by-Step Guide

A slow PC does not always need replacing. The cause might be one demanding application, low storage, pending updates, malware, overheating or hardware that no longer meets your needs.

Work through this guide in order and test the computer after each step. Avoid downloading “PC cleaner,” registry-cleaner or driver-updater programs from advertisements; they can create new problems and are rarely necessary.

IMPORTANT WINDOWS 10 NOTE

Microsoft ended free security support for Windows 10 on 14 October 2025. If your computer still uses Windows 10, check Microsoft's current support and upgrade options. A fast computer that no longer receives security updates is still a risk.

BEFORE YOU START

Save important files to a trusted backup location. If the computer belongs to an employer or school, contact its IT team before changing settings, uninstalling software or replacing hardware.

Write down when the slowdown happens:

• Is startup slow?

• Is only one application slow?

• Does the problem begin during video calls or gaming?

• Is the storage drive nearly full?

• Do the fans become loud and the computer feel hot?

• Did the problem begin after an update or installation?

This makes it easier to fix the cause instead of applying random tweaks.

1. RESTART THE COMPUTER

Choose Start, Power and Restart. Restart is different from closing a laptop lid or putting the computer to sleep. It ends running processes and can complete pending updates.

After restarting, open only the application you need and check whether performance improves.

2. CHECK TASK MANAGER

Press Ctrl + Shift + Esc to open Task Manager. Look at the Processes section and sort by CPU, Memory or Disk usage.

A temporary high reading is not automatically a problem. Watch for an application that remains near the top when you are not actively using it. Save your work before closing anything, and do not end Windows processes you do not recognise.

If one application is repeatedly responsible, update it, check its settings or use its official support page.

3. REDUCE STARTUP APPLICATIONS

In Task Manager, open Startup apps. Disable non-essential programs that do not need to launch whenever you sign in.

Do not disable security software, hardware utilities or workplace tools unless you understand their purpose. You can enable an item again if something stops working.

This step mainly improves startup and sign-in time; it will not solve every kind of slowdown.

4. INSTALL WINDOWS AND DRIVER UPDATES

Open Settings, select Windows Update and check for updates. Restart if requested.

Use Windows Update or the computer manufacturer's official support page for drivers. Avoid third-party driver-updater websites. A newer driver is not always faster, so do not replace a working driver without a reason.

If performance became worse immediately after an update, record the update name and date before troubleshooting further.

5. RUN A WINDOWS SECURITY SCAN

Open Windows Security, choose Virus & threat protection and run a Quick scan. If you still suspect malware, review Microsoft's additional scan options.

Do not install several real-time antivirus products at once because they can conflict and use extra resources. Be cautious with pop-ups claiming that hundreds of problems were found; use Windows Security or another security product you deliberately installed.

6. CHECK STORAGE

Open Settings, System and Storage. Review Cleanup recommendations or Storage Sense.

Check files before deleting them. Emptying the Recycle Bin or removing Downloads can permanently erase something you still need. Microsoft also warns that deleting a previous Windows installation removes the option to return to it.

There is no universal percentage of free space that guarantees speed. The practical goal is enough room for Windows, updates, applications and your working files.

7. REMOVE APPLICATIONS YOU DO NOT USE

Open Settings, Apps and Installed apps. Remove software you recognise and no longer need.

Do not uninstall device drivers, security tools, Microsoft system components or employer-managed software just because the name is unfamiliar. Search the publisher's official documentation or ask IT first.

8. CHECK BROWSER PERFORMANCE

A browser with many active tabs or extensions can consume substantial memory and processor time.

Close tabs you no longer need, restart the browser and disable extensions you do not trust or use. Keep the browser updated. If only one website is slow, the problem may be that site or your connection rather than the PC.

9. REVIEW POWER MODE

On a laptop, open Settings, System, Power & battery and review Power mode. Balanced is appropriate for many people. Best performance may help demanding work while plugged in, but it can use more power, create more heat and reduce battery life.

If the laptop slows down only on battery, compare its behaviour while connected to the correct charger.

10. CHECK HEAT AND AIRFLOW SAFELY

Performance can fall when a computer becomes too hot. Place a laptop on a firm surface and keep its vents clear. Do not use it on bedding or cushions that block airflow.

Turn the computer off and disconnect power before cleaning external vents. Do not open a laptop or power supply unless you are trained to do so. If the fan grinds, the case swells, there is a burning smell or the battery appears swollen, stop using the device and seek qualified repair help.

11. DECIDE WHETHER HARDWARE IS THE LIMIT

Task Manager's Performance section can show whether memory, processor, disk or graphics resources are under heavy use.

More memory can help when your normal workload consistently exhausts available RAM, but only if the model supports an upgrade. An SSD can improve startup and loading times on a system that still uses a mechanical hard drive, but it will not fix every problem.

Before buying parts, confirm:

• The exact computer model

• Whether components are replaceable or soldered

• Supported memory type and capacity

• Drive size and interface

• Warranty implications

• The cost of parts, data transfer and installation

Back up data before any drive replacement. If you are unsure, use a reputable repair technician.

12. USE WINDOWS RECOVERY ONLY AS A LAST RESORT

Recovery or reset can help with serious software problems, but it is not the first speed-up step.

Back up your files, confirm that you can sign back into your accounts, save any BitLocker recovery key and make sure you have application licences or installation details. Read Microsoft's Reset your PC guidance carefully because the available choices affect applications, settings and personal files.

Do not assume a reset will take a particular number of minutes. The time varies by device and recovery option.

WHEN A NEW COMPUTER MAY MAKE MORE SENSE

Replacement may be reasonable when the PC cannot run a supported operating system, the required application exceeds its hardware capabilities, repairs cost too much, or several essential components are failing.

Compare the complete repair cost with a suitable replacement. Do not replace a working computer merely because a cleaner advertisement says it is “outdated.”

QUICK TROUBLESHOOTING ORDER

1. Back up important files.

2. Restart and retest.

3. Identify heavy usage in Task Manager.

4. Reduce unnecessary startup applications.

5. Install official updates.

6. Run a Windows Security scan.

7. Review storage and unused applications.

8. Check browser load, power mode and cooling.

9. Consider compatible hardware upgrades.

10. Use recovery options only after preparation.

SOURCES AND FURTHER READING

Microsoft Support — Tips to improve PC performance in Windows:

https://support.microsoft.com/en-us/windows/experience/performance-optimization/tips-to-improve-pc-performance-in-windows

Microsoft Support — Free up drive space in Windows:

https://support.microsoft.com/en-us/windows/experience/storage-filemanagement/free-up-drive-space-in-windows

Microsoft Support — Stay protected with the Windows Security app:

https://support.microsoft.com/en-us/windows/security/windows-security/stay-protected-with-the-windows-security-app

Microsoft Support — Change the power mode for your Windows PC:

https://support.microsoft.com/en-us/windows/change-the-power-mode-for-your-windows-pc-c2aff038-22c9-f46d-5ca0-78696fdf2de8

Microsoft Support — Reset your PC:

https://support.microsoft.com/en-us/windows/experience/backup-recovery/reset-your-pc

FINAL VERDICT

Start with diagnosis and free fixes. A restart, official updates, fewer startup applications, adequate storage and a security scan can resolve many common slowdowns. Upgrade hardware only after identifying a genuine limitation, and treat resetting Windows as a prepared last resort.

Editorial note: This article provides general troubleshooting information. Back up important data before recovery or hardware work. It contains no paid product placement and does not claim hands-on testing of every computer configuration.