Windows 11 looks great, but many users notice that after a few months their PC starts to feel sluggish. Apps take longer to open, boot time grows, and the fan runs constantly. The good news is that in most cases you don’t need a new computer. A few settings and habits can bring back most of the lost speed.
This guide walks through ten fixes in order, from the easiest to the more advanced. Start from the top and test your PC after each step.
1. Restart Your PC and Install Pending Updates
It sounds basic, but a PC that has been running for days can build up memory leaks and stuck processes. Restart first, then go to Settings > Windows Update and install anything pending. Updates often include performance and driver fixes.
2. Disable Unnecessary Startup Apps
Too many programs launching at startup is the number one cause of slow boot times.
- Press Ctrl + Shift + Esc to open Task Manager.
- Open the Startup apps tab.
- Right-click any app you don’t need at startup (chat apps, game launchers, updaters) and choose Disable.
Pay attention to the “Startup impact” column and disable the ones marked High first. Disabling doesn’t uninstall the app. You can still open it manually.
3. Free Up Disk Space
Windows needs breathing room to work well. If your system drive is more than 85–90% full, performance drops noticeably.
- Go to Settings > System > Storage.
- Turn on Storage Sense to clean temporary files automatically.
- Open Temporary files and remove old Windows Update files, the Recycle Bin, and the Downloads clutter you no longer need.
- Uninstall programs you don’t use from Settings > Apps > Installed apps.
4. Switch to Best Performance Power Mode
On laptops especially, Windows may be throttling your CPU to save battery. Go to Settings > System > Power & battery and change Power mode to Best performance while plugged in.
5. Reduce Visual Effects
Animations and transparency look nice but use GPU and CPU resources, which matters on older or budget machines.
- Open Settings > Accessibility > Visual effects.
- Turn off Transparency effects and Animation effects.
For a bigger change, search for “Adjust the appearance and performance of Windows” in the Start menu and select Adjust for best performance.
6. Stop Apps From Running in the Background
Many Microsoft Store apps keep working even when you’re not using them. In Settings > Apps > Installed apps, click the three dots next to an app, choose Advanced options, and set Let this app run in the background to Never for apps you rarely use.
7. Scan for Malware
Slowness can be a sign of unwanted software. Open Windows Security > Virus & threat protection and run a Quick scan. If you still suspect something, use Scan options > Microsoft Defender Offline scan, which restarts your PC and checks it before Windows loads.
8. Repair Corrupted System Files
Damaged system files can cause freezes and crashes. Open Command Prompt as Administrator and run these commands one after another:
sfc /scannow
DISM /Online /Cleanup-Image /RestoreHealthThe process can take several minutes. Restart when it finishes.
9. Check Your Hardware: SSD and RAM
If none of the software fixes help, the hardware may be the bottleneck. Open Task Manager and check the Performance tab.
- Disk at 100% all the time? If you’re still using a traditional hard drive (HDD), upgrading to an SSD is the single biggest speed boost you can make.
- Memory constantly above 80–90%? Adding RAM (8 GB is the practical minimum today, 16 GB is more comfortable) will reduce lag when multitasking.
10. Reset Windows as a Last Resort
If your PC is still slow after everything above, a fresh start can solve deep software problems. Go to Settings > System > Recovery > Reset this PC. You can choose Keep my files, but back up your important data first anyway.
Things to Avoid
- “PC booster” or registry cleaner tools. Most promise miracles and deliver little, and some bundle unwanted software.
- Disabling Windows services at random. You can break features such as updates or networking.
- Running multiple antivirus programs. They conflict and slow the system down. Microsoft Defender is enough for most users.
Frequently Asked Questions
Why is my Windows 11 PC suddenly slow?
Common causes are a recent update running in the background, a full drive, too many startup apps, or malware. Check Task Manager to see which process is using the most resources.
Does a clean install make Windows 11 faster?
Usually yes, especially on a PC that has been used for years, because it removes accumulated software clutter. Try the earlier steps first, since they’re less disruptive.
Is 4 GB of RAM enough for Windows 11?
It meets the minimum requirement, but you’ll likely feel lag with modern browsers and apps. 8 GB or more is recommended.
Conclusion
Most slow Windows 11 PCs can be fixed with simple steps: control startup apps, free disk space, adjust power and visual settings, and keep the system clean and updated. If your hardware is outdated, an SSD upgrade is the most worthwhile investment. Try these fixes in order, and let us know in the comments which one made the biggest difference for you.
Related: The fastest way to disable AI features in Windows 11
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