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

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ksignorini

Member
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!
 
ksignorini said:
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!
Click to expand...
Hi, did you check the CPU on the Windows side, is it OK?
 
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.).
 
I have same problem. Fans running nuts with Windows 10 VM running and macbook pro is running pretty hot!
 
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