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HillenL's avatar
HillenL
Iron Contributor
Aug 04, 2025

High CPU Usage from ‘Service Host: SysMain’ Should I Disable It ??

There has been persistent system slowdowns on  my windows 10 PC, and after checking Task Manager. I noticed that "Service Host: SysMain" is consistently using 20-40% of my CPU, even after I boot it. 

The specs on the PC : 

  • Windows 10 pro 
  • Intel core i5.  
  • 8gb ram. 
  • 1tb hdd. 

is it safe to permanently disable SysMain on a system with an HDD? will it affect boot times or app performance long term? What can I do to reduce SysMain's resource usage rather than disabling it completely ?

4 Replies

  • Sideronkiro's avatar
    Sideronkiro
    Iron Contributor

    To reduce resource usage, stop the service temporarily or set it to manual, then monitor your system's performance.

    • HillenL's avatar
      HillenL
      Iron Contributor

      Thank you for the reply I appreciate it 

  • Olaann's avatar
    Olaann
    Iron Contributor

    Disabling SysMain on an HDD system is safe and can improve performance if you're experiencing high CPU usage.

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