High CPU Usage in Windows 8.1 VM with Version 10.0.2 (27712)

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ParagC

Junior Member
Here we go again: I suffered through this with v9 before it sorted itself out through one of the many updates, but now it's back in v10. It only started after the 27712 update from last week. I get 99-101% CPU usage in Activity Monitor for the Windows 8 VM, and the fan in my MBP is running almost constantly now. There is absolutely nothing running in the VM by the way - I've just been letting it sit idle after a fresh boot. Anyone else seeing this?
 
I too am seeing this. My VM has been running in a window and it chews CPU terribly, but when I went to full-screen it dies right now and stays low, even after going back to a window. Maybe a coincidence but try it out.
 
Nevermind on going full screen being a fix. Pure coincidence. My CPU definitely dies down to about 20-40% (out of %400) after about 10-15 minutes though. Which still seems high. I wish I hadn't applied one of PL10's "config profiles", but I did. I think next I'll try setting the VM to 1 CPU instead of 4.
 
I've already verified the # of CPUs is set to 1 (as it has always been). I suspect that's why I'm "only" seeing 100% CPU, instead of 400% like you. I can't believe I am stupid enough to keep coughing up $50 for every annual upgrade, when 8 years of annual upgrades have always gone like this. Inexcusable.
 
For Windows 8.1 Pro: OK, So i have installed 27712 and the subsequent upgrade 28614 on my iMac 27 I5 with 32 Gb of RAM - running 4 Gb and 2 processors and 256 MB of video RAM and the VM is pulling 98% - 171% of CPU and performance and sluggish (ridiculously slow) performance. Machine is almost unusable. The strange thing is that I am running the same VM as a test on a I7 Macbook air running 27712 and the CPU utilization is in the very low double and single digits. Parallels Team: Can you explain?
 
I am having the exact same problem, my cpu is pinned and the VM ( windows 8.1 ) is unusable! I have reinstalled Yosemite, and a fresh copy of Parallels 10. It worked perfectly until I rebooted. After the reboot the VM is unusable. I have followed the uninstall/reinstall steps for Parallels and still having the same issues.
 

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I even changed from 2 cores down to 1 core as indicated in another forum. This was supposed to improve performance marginally but unfortunately it has made no difference, windows is still unusable.
 

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Hi,
I would suggest you to follow the steps provided below:
1) Follow the steps provided in this link: http://kb.parallels.com/112091 to improve virtual machine performance on your Mac.
2) Also please follow the steps mentioned in this article: http://kb.parallels.com/en/122767 if your Virtual Machine is extremely slow after the upgrade to Parallels desktop 10 and Yosemite.
If the issue still persists, please create a Problem Report ID and provide us the Problem Report ID number so that we will check it for you.
To create a Problem Report ID, please follow this link: http://kb.parallels.com/9058
 
Mervin@Parallels said:
Hi,
I would suggest you to follow the steps provided below:
1) Follow the steps provided in this link: http://kb.parallels.com/112091 to improve virtual machine performance on your Mac.
2) Also please follow the steps mentioned in this article: http://kb.parallels.com/en/122767 if your Virtual Machine is extremely slow after the upgrade to Parallels desktop 10 and Yosemite.
If the issue still persists, please create a Problem Report ID and provide us the Problem Report ID number so that we will check it for you.
To create a Problem Report ID, please follow this link: http://kb.parallels.com/9058
Click to expand...
Running the above sudo command ( NVRAM fix ) did actually work, and I can now use my vm partition with windows again.
 
I too ran the sudo command in terminal and CPU usage went from 120%+ to 20% - 30% and Windows in now usable. When Parallels works it is great but why do we have to go through a maze of fixes every time there is an update?
 
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