How to Speed Up a Slow Windows PC

A slow Windows PC is usually not one problem but a pile of small ones: too many startup apps, a nearly full drive, missed updates, or failing hardware. Before you reformat anything, work through the causes in order. Most computers recover a surprising amount of speed from a few careful changes.

This guide focuses on Windows 10 and 11. Make a backup of important files before major changes, and avoid "optimizer" tools that promise one-click magic.

Measure first

Open Task Manager with Ctrl+Shift+Esc and look at the Performance tab. Note which resource stays near 100%: CPU, memory, disk, or network. That tells you where to spend your effort.

Things you'll need

• Your Windows PC and charger
• An external drive or cloud backup for important files
• Windows administrator access
• About 60–90 minutes

Step-by-step

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Step 1: Restart, then check for updates

A full restart clears temporary problems that a sleep cycle does not. Then go to Settings > Windows Update and install pending updates. Restart again if prompted. Old updates can slow boot times and cause driver conflicts.

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Step 2: Trim startup apps

Open Task Manager > Startup apps and disable programs you do not need at login. Focus on apps marked "High" impact. Leave security software and system utilities enabled. You can always reopen an app from the Start menu.

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Step 3: Free up disk space

Windows needs free space for updates and temporary files. Aim for at least 10–15% free on the system drive. Use Settings > System > Storage to review large folders and run Storage Sense. Uninstall apps you no longer use.

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Step 4: Scan for malware

Run a full scan with Windows Security. If you use a third-party antivirus, run its scan instead and avoid running two real-time scanners at once. Remove anything it flags, then restart.

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Step 5: Check memory and disk health

In Task Manager, see whether memory sits near 100% during normal work. Under 8 GB is tight for modern browsers and apps. Also check whether your system drive is a hard drive; upgrading to an SSD is the single biggest speed improvement for older machines.

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Step 6: Reduce browser load

Browsers are often the real memory hogs. Close unused tabs, remove extensions you do not use, and enable memory saver features if available. A clean browser can feel like a new computer.

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Step 7: Adjust power and graphics settings

Set the power mode to Balanced or Best Performance, especially on a laptop plugged in. Check Settings > System > Display > Graphics for apps using the wrong GPU. Avoid "high performance" on battery unless you need it.

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Step 8: Know when to reinstall or upgrade

If the machine is more than eight years old, has a spinning drive, or cannot hold 8 GB of RAM, software tweaks have limits. A clean Windows install can help; hardware upgrades help more. Back up first.

Tips

• Note your before-and-after boot time so you can tell whether a change helped.
• Keep at least 15% of the system drive free.
• Uninstall one program at a time and test, so you know what caused a problem.
• Avoid registry cleaners and "PC speedup" downloads — they rarely help and can cause harm.

Warnings

• Back up important files before uninstalling software, changing partitions, or reinstalling Windows.
• Do not disable system services or security features you do not understand.
• If you hear clicking or grinding from a hard drive, stop using it and back up immediately — the drive may be failing.

Frequently asked questions

Will a factory reset make my PC faster?

It can remove accumulated clutter, but it will not fix failing hardware or add RAM. Back up your files first, and reinstall only the apps you actually use.

Does Disk Cleanup help?

Sometimes. If the drive is nearly full, clearing temporary files and old updates can restore enough free space to improve performance. It will not transform an old hard drive.

Why is my PC still slow after all this?

Check temperatures and drive health, then consider an SSD or more RAM. If the machine is very old, replacement may be more economical than repair.