A Windows 11 PC can gradually become slower even if it worked perfectly when you first bought it.
Common causes include too many startup applications, low storage space, background processes, outdated drivers, malware, or limited hardware.
Before buying a new computer, try these steps.
1. Restart Your PC
If your computer has been running for days without a proper restart, background processes may be consuming memory.
Select:
Start → Power → Restart
After restarting, open only the programs you actually need.
2. Check Task Manager for Heavy Apps
Press:
Ctrl + Shift + Esc
to open Task Manager.
Under Processes, look at the:
CPU / Memory / Disk
columns.
If one program is constantly using a large percentage of your system resources, close it if you do not need it.
Be careful not to end Windows system processes you do not recognize.
3. Disable Unnecessary Startup Apps
Programs that automatically launch with Windows can increase boot time and continue using memory in the background.
Open:
Task Manager → Startup apps
Disable programs you do not need immediately after startup.
Microsoft also recommends reducing unnecessary startup apps when improving Windows performance.
Do not disable security software or hardware utilities unless you understand what they do.
4. Free Up Storage Space
Low free disk space can affect Windows performance and interfere with updates.
Go to:
Settings → System → Storage
Review:
Temporary files
and remove items you no longer need.
You can also enable Storage Sense, which can automatically remove unnecessary temporary data.
Microsoft notes that low storage can reduce performance and recommends Storage Sense and Windows cleanup tools.
5. Uninstall Apps You Never Use
Go to:
Settings → Apps → Installed apps
Review the list.
If there are large applications or games you no longer use, select the three-dot menu and choose:
Uninstall
Removing unnecessary programs can free storage and reduce background activity.
6. Install Windows and Driver Updates
Open:
Settings → Windows Update → Check for updates
Install available updates.
Then check:
Windows Update → Advanced options → Optional updates
Optional updates may include newer hardware drivers.
Microsoft notes that Windows updates can include performance improvements and fixes.
7. Run a Malware Scan
Malware can use CPU, memory, disk, and network resources.
Open:
Windows Security → Virus & threat protection
and run a Quick scan.
If you suspect a serious infection, you can run a more thorough scan from the scan options.
8. Reduce Background Activity
Some applications continue running even when they are not open.
Go to:
Settings → Apps → Installed apps
Select an app’s advanced options if available and check its background permissions.
For apps that do not need background activity, you can restrict them.
9. Change Power Mode When You Need More Performance
On supported PCs, go to:
Settings → System → Power & battery
Find Power mode.
When plugged in and when battery life is not important, you may choose a higher-performance mode.
Keep in mind that higher performance can increase power consumption, battery drain, and heat. Microsoft specifically notes this tradeoff.
10. Consider Your Hardware
Software optimization has limits.
If your PC regularly reaches very high memory usage while doing normal work, you may need more RAM.
If the PC still uses an old mechanical hard drive, moving Windows to an SSD can make a major difference in responsiveness.
Older processors may also struggle with modern applications even after optimization.
Frequently Asked Questions
Why did Windows 11 suddenly become slow?
Check Task Manager first. A background application, update, malware scan, or low storage condition may be consuming resources.
How much free storage should I keep?
There is no single percentage that fits every PC, but Windows should have enough free space for temporary files and updates. If your drive is nearly full, free space before troubleshooting anything else.
Does reinstalling Windows make a PC faster?
It can resolve severe software problems, but it should not be your first solution. Startup apps, storage, updates, and background processes should be checked first.
Final Thoughts
If Windows 11 is running slowly, start with Task Manager and startup applications.
Then check storage, updates, and malware.
If your system remains slow despite having a clean software setup, the limitation may be the hardware rather than Windows itself.