Open Task Manager and sort by CPU, Memory and Disk one at a time. Then close the actual high-usage process instead of using a generic cleaner.
On Windows 11, menu names vary by build. Use built-in Settings and Microsoft Support guidance before registry edits or third-party repair tools.
Start by narrowing the cause
- a background process is using CPU, RAM or disk continuously
- too many startup apps are running
- storage is almost full
- a browser/app workload exceeds available memory
- an update, driver or security scan is temporarily using resources
Fix it in this order
- Open Task Manager and sort by CPU, Memory and Disk one at a time.
- Close the actual high-usage process instead of using a generic cleaner.
- Disable unnecessary startup apps.
- Free storage if the system drive is close to full.
- Install updates and restart after a major system or driver change.
Use a clean A/B test
After the same apps are open and the PC has settled, check Task Manager again to see whether the same process still holds CPU use above its normal idle level.
How to confirm the fix
Measure idle usage and the same workload before and after the change; “feels faster” is less useful than a repeatable difference.
When to use support or repair
If CPU use remains high while the PC is idle, note the top process in Task Manager, how long it stays elevated, and whether it began after an update or install. Record the Windows build and process name before contacting the app publisher or PC maker; do not end unfamiliar system processes as a first fix.
Frequently asked questions
Should I reset the whole device immediately?
Usually not. Try the guide’s reversible checks first and confirm whether the problem is limited to one app, file, device, or Windows component. Back up important files before considering Reset this PC.
How do I know when the fix is real?
Measure idle usage and the same workload before and after the change; “feels faster” is less useful than a repeatable difference.
Official sources and further reading
Windows Settings paths can shift between releases. Search for the named control and note your Windows build if an option is missing.