[Solved] Windows 11 Host Update causing Windows 10 Guest slowness

Discussions about using Windows guests in VirtualBox.
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mrubcich
Posts: 4
Joined: 26. May 2021, 07:25

[Solved] Windows 11 Host Update causing Windows 10 Guest slowness

Post by mrubcich »

Hey guys, my apologies if I'm posting this in the wrong place.
I recently updated a virtual box host machine to Windows 11 and now one of my Windows 10 machines is crawling after a few hours of use.
I get good performance after a full reboot of the VM (sometimes about 10% of the time it's still incredibly slow to respond).
I'm running a pretty standard software developer stack of applications on this machine. MSVS2019, SQLStudio, VS Code, etc..

The guest VM has 16 gigs of memory, 4 processors, 128 MB of video memory.
The host PC is a Lenovo laptop, 32 gigs of memory, i7 9th gen with 6 cores at 2.6 base clock.
Battery conservation is turned off and set to performance mode.

Can you think of anything I'm not thinking I could/should do to improve performance?
Thank you VERY much.

PS: I am also sometimes losing support for my monitor's native 1080 resolution in the device manager which hasn't happened before..
This isn't an issue because I can get around this with fullscreen mode and or a restart. Just an interesting aside which might help isolate what my issue is.
mpack
Site Moderator
Posts: 39156
Joined: 4. Sep 2008, 17:09
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: Mostly XP

Re: Windows 11 Host Update causing Windows 10 Guest slowness

Post by mpack »

You likely enabled Hyper-v on the host. That generally makes all VirtualBox VMs run slow, not just Win10.

See HMR3Init: Attempting fall back to NEM (Hyper-V is active). You don't have the error message, but the solutions still apply.
mrubcich
Posts: 4
Joined: 26. May 2021, 07:25

Re: Windows 11 Host Update causing Windows 10 Guest slowness

Post by mrubcich »

Yup! I enabled Hyper-V to support docker and completely forgot that might even impact it.
I followed the instructions and it seems to be back to working great.
Thank you very much!
- Matt
mpack
Site Moderator
Posts: 39156
Joined: 4. Sep 2008, 17:09
Primary OS: MS Windows 10
VBox Version: PUEL
Guest OSses: Mostly XP

Re: Windows 11 Host Update causing Windows 10 Guest slowness

Post by mpack »

You're welcome. Nice to have such an easy one.
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