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Ahmadom's avatar
Ahmadom
Copper Contributor
Aug 25, 2026

Task Manager show high CPU usage on my PC

My PC's Task Manager consistently shows high CPU usage, often peaking at 90-100% even when only a few programs are running, causing noticeable system slowdowns and lag. I have checked for background processes and malware, but the high usage persists, and I am looking for advice on diagnosing the root cause and fixing it.

2 Replies

  • Eliseour's avatar
    Eliseour
    Tin Contributor

    If the process is a critical system file like explorer.exe or winlogon.exe, do not end it. If you're unsure, search the process name online first to identify what it is.

  • Please refer following suggestions:

    -Turn off background apps for less important apps:

    • Click Start > Settings > Apps > Installed apps.
    • Select an app, select More options (…), and then select Advanced options.
    • Under Background app permissions, in the Let this app run in the background list, select Never.

    -Perform System File Checker scan using sfc /scannow command.

    -Perform system scan in Windows Security and also perform a malware scan.

    -Free up disk space and delete unnecessary files.

    Let us know if this helps!