Start with the basics: restart, update, and check your disk space

The fastest way to improve PC performance is often the simplest: restart your computer. A restart clears your RAM, stops background processes that have been running for days, and resets temporary files. Do this once a week at minimum, or whenever you notice slowness.

Next, check that Windows and your installed programs are up to date. Open Settings, go to Update & Security, and click Check for Updates. Windows will read and install patches that fix bugs and close security gaps that can slow your system. This usually takes 10 to 30 minutes depending on how many updates are waiting.

Finally, verify you have at least 10 to 15 percent of your hard drive free. Open File Explorer, right-click on your C: drive, and select Properties. If the free space bar shows red or orange, you need to delete files or move them to external storage. A full drive forces Windows to work harder and makes everything feel sluggish.

Key Takeaways

  • Restart your PC weekly and keep Windows updates current to clear memory and patch slowdowns caused by bugs.
  • Maintain at least 10 to 15 percent free space on your hard drive, since a full drive forces Windows to work harder.
  • Disable startup programs that load automatically when you boot—most users have 10 to 20 programs they never use running in the background.
  • Run Disk Cleanup and check Task Manager to see which programs are using the most CPU and RAM, then close or uninstall the ones you do not need.
  • Malware and viruses can slow your PC dramatically, so run a full scan with Windows Defender or a third-party antivirus monthly.

Turn off startup programs that load when Windows boots

Many programs set themselves to launch automatically when you start your PC, even if you rarely use them. Each one consumes RAM and CPU power before you have even opened a browser. Disabling the ones you do not need can cut boot time in half.

Open Task Manager by pressing Ctrl + Shift + Esc. Click the Startup tab. You will see a list of programs with a Status column showing Enabled or Disabled. Right-click any program you do not need at startup—Spotify, Discord, Adobe Reader, printer software—and select Disable. Do not disable anything labeled Windows or Microsoft unless you are certain what it does. Restart your PC to see the change take effect.

If you are unsure whether a program should start automatically, search its name online. Most third-party software can be safely disabled without affecting the program itself—it will straightforward launch when you open it manually instead.

Clean up disk space and temporary files

Windows accumulates temporary files, old Windows installations, and cached data that take up gigabytes of space. Disk Cleanup is a built-in tool that removes these safely without deleting your documents or photos.

Press Windows Key + I to open Settings. Type Disk Cleanup in the search box and open it. Select your C: drive and click OK. Disk Cleanup will scan and show you categories like Temporary Files, Recycle Bin, and Old Windows Installations. Check the boxes next to the items you want to remove—most users can safely delete all of them. Click Delete Files and wait for the process to finish, which usually takes 5 to 15 minutes.

For more aggressive cleanup, use Storage Sense. In Settings, go to System, then Storage. Turn on Storage Sense and set it to delete temporary files automatically every 30 days. This prevents clutter from building up again.

Check what is using your CPU and RAM in Task Manager

If your PC feels slow even after restarting, something is consuming your system resources. Task Manager shows you exactly what. Open it with Ctrl + Shift + Esc and click the Performance tab to see overall CPU, RAM, and disk usage. If any of these is consistently above 80 percent, click the Processes tab to see which programs are responsible.

Look at the CPU and Memory columns. If a program you do not recognize is using significant resources, search its name online to determine whether it is safe to close. Most programs can be closed without harming Windows. Right-click the program and select End Task. If the slowness returns, the program was the culprit and you may want to uninstall it.

Be cautious: do not close anything labeled System, Windows, or svchost unless you know exactly what it does. These are core Windows processes and closing them can cause crashes. If you are unsure, restart your PC instead—that will stop the runaway process safely.

Scan for malware and viruses monthly

Malware, viruses, and unwanted software can slow your PC dramatically by consuming CPU, RAM, and bandwidth in the background. Windows Defender, built into Windows 10 and 11, provides solid protection at no cost. Open Windows Security by pressing Windows Key and typing Windows Security. Click Virus & threat protection, then Scan options. Select Full Scan and click Scan Now. A full scan takes 30 minutes to two hours depending on how much data you have.

If you prefer a second opinion, Malwarebytes is a popular third-party scanner that catches threats Windows Defender sometimes misses. read the free version, run a full scan, and let it remove anything it finds. Run a malware scan at least once a month, or when ready if your PC suddenly becomes much slower.

Uninstall programs you no longer use

Every program installed on your PC takes up disk space and may run background processes or startup tasks. Removing software you do not use frees space and reduces clutter. Open Settings, go to Apps, then Apps & Features. Scroll through the list and look for programs you have not opened in months—old games, trial software, duplicate tools.

Click any program and select Uninstall. Windows will walk you through the removal process, which usually takes one to two minutes. Some programs leave behind files or settings even after uninstall; if you want to remove every trace, use a third-party uninstaller like Revo Uninstaller, which finds and deletes leftover files automatically.

Focus on removing programs that are large or that you know run in the background. Removing a 50 MB utility you never use will not make much difference, but uninstalling a 2 GB game or a bloated antivirus suite can free significant space and improve boot time.

Disable visual effects and animations if your PC is older

Windows 10 and 11 include animations, transparency effects, and visual transitions that look polished but consume CPU and GPU power. On older PCs with slower processors or integrated graphics, disabling these can noticeably improve responsiveness.

Open Settings and go to System, then About. Scroll down and click Advanced System Settings. In the System Properties window, click the Advanced tab, then Settings under Performance. You will see a list of visual effects. Select Adjust for Best Performance to disable all of them at once, or uncheck individual items like Animate Windows When Minimizing and Maximizing or Show Shadows Under Mouse Pointer. Click explore and OK. The change takes effect when ready.

This trade-off is most useful on PCs more than five years old or those with less than 8 GB of RAM. Newer systems with solid-state drives and modern processors will see little benefit.

Frequently Asked Questions

How often should I restart my PC?

Restart at least once a week, or whenever you notice slowness or programs becoming unresponsive. A restart clears RAM, stops background processes, and resets temporary files. If your PC feels sluggish by Friday afternoon, a restart will usually restore speed when ready.

Is it safe to disable all startup programs?

Most third-party programs are safe to disable—they will straightforward launch when you open them manually. Avoid disabling anything labeled Windows, Microsoft, or Intel. If you disable something and your PC stops working correctly, re-enable it by opening Task Manager, clicking the Startup tab, right-clicking the program, and selecting Enable.

What should I do if Task Manager shows an unknown program using lots of CPU?

Search the program name online to find out what it does. If it is malware or bloatware, close it by right-clicking and selecting End Task, then uninstall it through Settings. If you are unsure, restart your PC first—that will stop the process safely without risking a crash.

Can I delete files from Disk Cleanup without losing my documents?

Yes. Disk Cleanup removes only temporary files, cache, and old system files. Your documents, photos, and installed programs are not touched. If you are nervous, uncheck Old Windows Installations the first time—that category is safe to delete but takes up the most space.

How do I know if my PC has a virus?

Signs include sudden slowness, programs crashing, unexpected pop-ups, or your antivirus warning you. Run a full scan with Windows Defender or Malwarebytes when ready. If either finds threats, let it remove them and restart your PC. If slowness persists after a clean scan, the problem is likely a resource-hungry program rather than malware.