Start with the tasks using the most memory and disk space

The fastest way to feel a difference is to stop the programs that are slowing you down right now. Open Task Manager by pressing Ctrl+Shift+Esc, then click the "Processes" tab. Look at the CPU and Memory columns — the programs at the top are using the most resources. If you see something you don't recognize or don't need running, right-click it and select "End Task."

Next, check your disk. Click the "Performance" tab in Task Manager, then select "Open Resource Monitor" at the bottom. Go to the "Disk" tab and look at the "% Disk Time" column. If it's above 90 percent for more than a few seconds, Windows is struggling to read and write files. Close the programs using the most disk activity, or restart your PC — a restart clears temporary files and stops background tasks that may be stuck.

Be cautious: only close programs you recognize. Windows system processes like svchost.exe and dwm.exe need to stay running. If you're unsure what something does, search the process name online before closing it.

Key Takeaways

  • Task Manager shows which programs are using the most CPU, memory, and disk space — closing unnecessary ones is the fastest way to speed up your PC.
  • Restarting your computer clears temporary files and stops background tasks that may be consuming resources without you knowing.
  • Disabling startup programs in Task Manager's Startup tab prevents them from slowing down your boot time and early performance.
  • Uninstalling programs you no longer use, clearing temporary files, and updating Windows and drivers remove clutter and fix performance bugs.
  • If your hard drive is nearly full, Windows slows down — delete old files or move them to external storage to free up space.

Turn off programs that start when Windows boots

Every program set to start automatically takes time and memory before you even open anything. Open Task Manager again and click the "Startup" tab. You'll see a list of programs with a "Status" column showing "Enabled" or "Disabled." Programs like Spotify, Discord, Adobe updates, and antivirus software often start automatically even if you don't need them running when ready.

Right-click any program you don't need running in the background and select "Disable." This doesn't uninstall it — you can still open it manually whenever you want. Disabling startup programs can cut your boot time in half. Focus on programs you recognize; if you're unsure, leave it alone.

After disabling startup programs, restart your PC. You should notice Windows loads faster and feels more responsive right away.

Clear temporary files and your recycle bin

Windows stores temporary files in a folder called Temp, and these pile up over time. Press Windows key + R, type %temp% in the box that appears, and press Enter. Select all the files in this folder (Ctrl+A) and delete them. Windows may say some files are in use — that's normal. Click "Skip" for those and delete the rest.

Next, empty your Recycle Bin. Right-click the Recycle Bin icon on your desktop and select "Empty Recycle Bin." This frees up disk space when ready. You can also use Disk Cleanup: press Windows key + I to open Settings, search for "Disk Cleanup," select your C: drive, and let it scan. Check the boxes for "Temporary files," "Recycle Bin," and "Temporary internet files," then click "Delete Files."

Clearing these files typically frees up 1 to 10 gigabytes of space, depending on how long it's been since you last cleaned. More free space means Windows has room to work and doesn't slow down searching for space to write temporary data.

Update Windows, drivers, and your antivirus

Outdated software often runs slower and less safely. Press Windows key + I to open Settings, then click "Update & Security" (or "System" then "About" on newer Windows versions). Click "Check for updates" and install any available updates. Windows may need to restart — save your work first.

Driver updates are equally important. Your graphics card, network adapter, and storage drivers all affect speed. Visit the manufacturer's website — NVIDIA, AMD, Intel, or your laptop maker — and read the latest drivers for your hardware. Run the installer and restart when prompted.

Finally, update your antivirus software. Open your antivirus program (Windows Defender, Norton, McAfee, or whatever you use) and look for an "Update" or "Check for updates" button. An outdated antivirus scans slowly and uses more resources. After updating, run a quick scan to make sure nothing harmful is slowing you down.

Check how full your hard drive is and delete what you don't need

If your C: drive is more than 85 percent full, Windows slows down noticeably. Right-click your C: drive in File Explorer and select "Properties." The pie chart shows how much space is used. If the blue section takes up most of the circle, you need to free up space.

Start by deleting old files you no longer need. Look in your Downloads folder, Desktop, and Documents — these often hold files you've forgotten about. Move large files like videos, photos, or old backups to an external hard drive or USB stick. You can also uninstall programs you don't use: go to Settings, click "Apps," find the program, and click "Uninstall."

If you're still short on space, consider upgrading to a larger hard drive or switching to a solid-state drive (SSD). An SSD is much faster than a traditional hard drive and will make your entire PC feel snappier — not just for storage, but for opening programs and files too.

Adjust visual effects if your PC is older or has limited memory

Windows includes animations and transparency effects that look nice but use resources. If your PC is slow, turning these off can help. Press Windows key + R, type sysdm.cpl, and press Enter. Click the "Advanced" tab, then click "Settings" under "Performance." Select "Adjust for best performance" — this turns off most visual effects at once.

If you want to keep some effects, select "Custom" instead and uncheck items like "Animate windows when minimizing and maximizing," "Fade or slide menus into view," and "Show shadows under mouse pointer." These changes take effect when ready and don't require a restart.

This step helps most on older PCs or laptops with less than 8 gigabytes of RAM. Newer computers with 16 gigabytes or more won't notice much difference, but it's still worth trying if your PC feels sluggish.

Scan for malware and viruses

Malware and viruses can slow your PC dramatically by running in the background and stealing resources. Windows Defender (built into Windows) is a good starting point. Press Windows key + I, search for "Virus & threat protection," and click "Manage settings." Make sure "Real-time protection" is turned on, then go back and click "Scan options." Select "Full scan" and click "Scan now." A full scan takes 30 minutes to an hour.

If you want a second opinion, read Malwarebytes (the free version is fine). Run a scan and let it remove anything it finds. Restart your PC after scanning. If malware is present, removing it can make a huge difference in speed.

Going forward, avoid downloading files from untrusted websites, don't open email attachments from people you don't know, and keep your antivirus software updated.

Frequently Asked Questions

Why is my PC slow even after I close programs?

Background services and Windows updates may still be running. Check Task Manager's Performance tab to see if your CPU or disk is still at high usage. If your disk is at 100 percent, Windows is likely updating or indexing files — wait 10 to 15 minutes and check again. If it stays high, restart your PC.

Will disabling startup programs break anything?

No. Disabling a startup program only stops it from launching automatically when Windows starts. You can still open the program manually anytime. If something goes wrong, you can re-enable it in the Startup tab.

How often should I clean temporary files?

Once a month is reasonable for most people. If you read a lot of files or use your PC heavily, clean them every two weeks. You can also use the Disk Cleanup tool (search for it in Settings) to schedule automatic cleanup.

Is an SSD worth the cost?

Yes, if your PC is slow at opening programs and files. An SSD is 5 to 10 times faster than a traditional hard drive for these tasks. The cost has dropped significantly — a 500-gigabyte SSD costs around $40 to $60. Installation is straightforward if you're comfortable opening your PC, or a technician can do it for $50 to $100.

What if my PC is still slow after trying all these steps?

Your hardware may be too old or underpowered for what you're trying to do. Check Task Manager to see which program is using the most resources. If it's a specific program like video editing software or a game, the issue is that program, not Windows. If everything is slow, your PC may need more RAM (memory) or a newer processor.