Fans go nuts! - Parallels 15, Windows 10, Catalina

Discussion in 'Windows Guest OS Discussion' started by ksignorini, Feb 18, 2020.

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  1. ksignorini

    ksignorini Bit Poster

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    I'm running Parallels Desktop 15 Pro with a Windows 10 guest on Catalina. For some reason, my fans (2015 15" MacBook Pro) spin up to full-blast as soon as the VM starts and any time a Windows program is running in the foreground. While not having focus, the fans still spin more than any other time, but maybe only about 50%.

    Activity Monitor doesn't show particularly high CPU for Parallels in most cases--in fact, right now, fans still spinning about 50%, it's at 0.1% CPU. As soon as I close Parallels, the fans stop. It also takes a LOT of Mac apps running on my MacBook any other time (in my testing) to make the fans spin anywhere near what they do with Parallels running.

    Thoughts? Is this a known problem? Any known solutions? I see lots of complaints but most have unreasonably high CPU usage.

    FYI: I'm using all parameters within the suggested values (2 out of 4 cores, 4 out of 16 GB RAM, etc.).

    Thanks!
     
  2. Maria@Parallels

    Maria@Parallels Parallels Team

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    5,720
    Hi, did you check the CPU on the Windows side, is it OK?
     
  3. ksignorini

    ksignorini Bit Poster

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    24
    I did and after more tests realize it's probably not Parallels but symptomatic of other problems with this computer.
     
  4. Maria@Parallels

    Maria@Parallels Parallels Team

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    5,720
    Thanks for the provided info, and please let us know if the issue reoccurs or you see any Parallels Desktop performance issue.
     
  5. HussainP

    HussainP Bit Poster

    Messages:
    1
    I'm running Parallels Desktop 15 Pro with a Windows 10 guest on Catalina. For some reason, my fans (2015 15" MacBook Pro) spin up to full-blast as soon as the VM starts and any time a Windows program is running in the foreground. While not having focus, the fans still spin more than any other time, but maybe only about 50%.

    Activity Monitor doesn't show particularly high CPU for Parallels in most cases--in fact, right now, fans still spinning about 50%, it's at 0.1% CPU. As soon as I close Parallels, the fans stop. It also takes a LOT of Mac apps running on my MacBook any other time (in my testing) to make the fans spin anywhere near what they do with Parallels running.

    Thoughts? Is this a known problem? Any known solutions? I see lots of complaints but most have unreasonably high CPU usage.

    FYI: I'm using all parameters within the suggested values (2 out of 4 cores, 8 out of 16 GB RAM, etc.).
     
  6. AlexS34

    AlexS34

    Messages:
    1
    I have same problem. Fans running nuts with Windows 10 VM running and macbook pro is running pretty hot!
     
  7. Maria@Parallels

    Maria@Parallels Parallels Team

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    5,720
    Hello, did you check and try instructions from this KB article?
     

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