Windows 10 extremely slow on Virtualbox 6

Discussions about using Windows guests in VirtualBox.

Re: Windows 10 extremely slow on Virtualbox 6

Postby Marco Sulla » 21. Jul 2021, 14:06

Excuse me, but IMHO it sounds simply like a Virtualbox 6.1 bug.
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Re: Windows 10 extremely slow on Virtualbox 6

Postby fth0 » 21. Jul 2021, 15:10

Marco Sulla wrote:Excuse me, but IMHO it sounds simply like a Virtualbox 6.1 bug.

It may or may not be a VirtualBox bug, no need to argue about that.

But since the majority of VirtualBox users do not experience your problem, the differences between your setup and that of other users will probably be important. What do you think other people could or should do to investigate a problem that they cannot reproduce?
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Re: Windows 10 extremely slow on Virtualbox 6

Postby mpack » 21. Jul 2021, 16:18

As far as I can see, we still do not have a process list from the guest.

It doesn't matter if VirtualBox has "a bug": CPU time doesn't just disappear, something is using it. It remains to be established that "something" is a VirtualBox process and not something else in the guest OS.

And bear in mind that all CPU use inside the guest appears as VirtualBox use to the host. That really tells us nothing much, apart from telling us that yes indeed: something is using a lot of CPU.
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Re: Windows 10 extremely slow on Virtualbox 6

Postby scottgus1 » 21. Jul 2021, 18:26

Another testing possibility: You're running Lubuntu, which is tuned for less host impact. If you can get another disk for the host PC, try installing a regular Ubuntu OS and official Virtualbox (and prerequisites) or even a test Windows 10 host OS (no need to activate) then try a fresh VM and see what the performance is.
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Re: Windows 10 extremely slow on Virtualbox 6

Postby TPF » 4. Aug 2021, 13:55

Hello,

In case it works for someone, I have discovered that to execute the option:

$ VBoxManage modifyvm "VM machine name" --hpet on

It greatly increases the performance of Windows 10 virtual machines and reduces the load on the host.

Saludos
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Re: Windows 10 extremely slow on Virtualbox 6

Postby mpack » 5. Aug 2021, 10:03

The HPET option has been reported in the past, unfortunately ISTR it also causes instability in the guest OS. It could still be worth a try though.
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