Question 1

Why is my CPU usage so high?

Accepted Answer

Short spikes during updates, scans, or games are normal. Sustained high CPU at idle usually means a browser with many tabs, a stuck Windows Update, an antivirus scan, or a crashed installer. Sort Task Manager by CPU and note the name. SysOverlay keeps live CPU on the desktop so you notice sustained load.

Question 2

How do I fix 100% CPU on Windows 11?

Accepted Answer

End the top process if it is a browser or leftover installer, pause a full-disk scan if one is running, restart once, then check Windows Update. If Antimalware Service Executable or System stays pegged for hours, run a Quick scan after hours and free disk space. SysOverlay does not kill processes remotely.

Question 3

Is high CPU always a virus?

Accepted Answer

No. Most high-CPU days are updates, browsers, or a sync client. Treat malware as one hypothesis after you identify the process — do not call a pop-up “support” number. SysOverlay shows the load; Windows Security does the scan.

Why is my CPU usage so high

Questions