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Beverly's avatar
Beverly
Brass Contributor
Jun 29, 2026

High Disk, CPU, or Memory Usage for No Reason

My Windows 11 PC has been running painfully slow lately, and when I open Task Manager, I see that disk usage is pinned at 100% and memory usage is hovering around 90% even when I have no applications open besides the Task Manager itself. I've already checked for malware, disabled all startup programs, and updated my drivers, but the high resource usage persists constantly, making even basic tasks like opening File Explorer or typing in a document feel sluggish and unresponsive.

3 Replies

  • rjdohnert's avatar
    rjdohnert
    Tin Contributor

    PC specs would help.  Depending on your system it could be an easy fix or more intensive.

  • GR80111's avatar
    GR80111
    Copper Contributor

    I have a similar problem of disk usage at 90%. I found that the System files are using 127gb ! with three folders using most of that  folder called Windows 51 gb, Program Files,37gb and Program Files (x86) 11gb.

    That is insane !  These folders are huge

    I ran Chkdsk /r thinking there was a disk problem but that doesn't appear to be it. 

    These folders and whatever they contain seem to be the problem. How do I fix it ?

    • rjdohnert's avatar
      rjdohnert
      Tin Contributor

      Upgrade or a fresh Windows install?  I would do a disk cleanup if I was you.  Sounds like you have a lot built up