Parallels Desktop 16 and Windows 10. Windows is extremely slow with 100% processor load

Same issue for me. Horrible performance on any configuration except 1 CPU and 4G.

This seems to me to be a pretty big "miss" by the Parallels team.

Thanks for posting, Michael. You're my Hero of the Day


MHofmann1965 said:
My Windows 10 Pro 2004 in the 64-bit version under Parallels Desktop 16 is extremely slow and the resource monitor shows a processor load of 100%.
I installed Windows 10 with an ISO DVD.
When booting into Windows, it takes 10 minutes before you can work at all.
When you click on the Windows symbol, it takes 30 seconds for the shutdown menu to open and another 10 minutes for it to shut down.
This is not a useful condition.
I've read through here in the forum and tried everything: Without success.
Now, through many tests, I have found the right setting where Windows runs quickly and smoothly (at least for normal Office applications).
Boot time until you can work: 20 seconds.
Time-consuming operations such as Windows 10 cumulative update: 5-10 minutes.
Open Word 2016: 20 seconds. That's enough !
My hardware:

Apple Mac Pro Early 2008 (3.1) w. 2 Intel Xeon 2.9 GHz (= 8 cores with 2.9 GHz)
16 GB of RAM
Graphics card Nvidia GeForce GT 630 with 2 GB RAM (metal-capable)
1 TB SSD (Samsung 860 EVO)
macOS Catalina 10.15.6 with patch for use with unsupported Macs
Parallels Desktop 16
Windows 10 Pro 2004 in the 64 bit version (installation from original ISO DVD)

Catalina runs very quickly and without problems. I use Photoshop and video editing software and it all goes super fast. With 8 cores with 2.9 GHz, no wonder.
The default setting is activated at Parallels:
Windows 10:
Processors used: 2
Storage: 3.5 GB
Adaptive hypervisor: On
Graphics card: memory automatically

Result: As described above, Windows 10 is extremely slow.
Now I thought: more processors = faster.
Processors used: 4
Boot time now: 30 minutes. Click on the Windows symbol: something happens after 2 minutes.
Shutdown: approx. 30 minutes.

So again 2 processors but adaptive hypervisor: off
No improvement. Boot time just under 10 minutes.

So more RAM allocated:
4 GB: no improvement
6 GB: no improvement
8 GB: no improvement

Graphic card:
a lot of RAM (2 GB): no improvement
little RAM (64 MB): no improvement.

I was at the end of my game !!

Now one last act of desperation (although illogical):
Processors: 1

Lo and behold: Windows is super fast!

Now after a few tries my final setting:
Processors used: 1
Memory 4 GB (4096 MB)
Adaptive hypervisor: Off
Graphics card: memory automatically.

Windows 10 is now fast and usable.

And now the hit, where I let myself be misled:
It is still displayed on the Resource Monitor:
Windows 10: CPU 100% and RAM 4.1 GB
And in the system tray it says CPU usage between 30 and 100%
Significant CPU is used: Windows Services
And even if the CPU is red (100%), Windows runs quickly and smoothly.

These tips are meant to be of help to anyone who has a similar problem!
greeting
Michael Hofmann
Click to expand...
 
I want my money back. Parallels 17 running Windows 10 is a joke. It's completely horrible. SLOW SLOW SLOW SLOW SLOW SLOW
 
Hi,
I had the same problem and the Parallels hypervisor is just so bad with VMs.
Go To ==> Materials ==> CPU and Memory ==> Click Advanced ==> Change the hypervisor to Apple.
You should be ok
Cheers
 
Wow, I've been frustrated living with crappy parallels performance for some time. After reading this thread, I changed to the Apple Hypervisor and wow, what a difference! Parallels is now usable again! Thank you.
 
Same here. Windows 10 is practically unusable. Allowed only 1 CPU and now better but still slow. Please fix this already.
 
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