Several times now I observed Ubuntu hanging and I focus that window, and the boot screen prints out a warning for each CPU core telling me it's 'stuck'. Most of the time I can bring it out of it by focusing the VirtualBox VM Manager window, which makes no sense. In a few Linux VMs (one Ubuntu, two are Linux-based I installed from an OVA, not sure which distro they're based on) I noticed the VM will hang occasionally. Things are still sluggish but at least they're usable.

This option did not cause problems like this with Hyper-V disabled. The first big thing I figured out is disabling 'Enable nested paging' on a VM massively speeds the VM up to almost as fast as it was with Hyper-V off. I started messing around with the guest settings. Oracle should make improving VirtualBox running with Hyper-V a focus if it is not already. As an aside, I think with all the cool features MS are throwing into Windows which need Hyper-V, it is less and less of a favorable trade off to disable all those features for VirtualBox. Unfortunately Googling didn't find me much, mostly recommendations to disable Hyper-V. But since I want to keep Hyper-V I did some digging to try and actually resolve it. So now I am back to seeing massive slowdown (and as I saw similar slowdown on Windows 10, I think it's not a Win11 issue). Previously in Win10 I had kept it disabled since it caused massive, unusable slowdpwn in VBox, even versions which claimed to run with Hyper-V enabled. I have had no issues with Windows 11 yet though.Īnyway with the release of Windows Subsystem for Android I was convinced to reenable Hyper-V, after keeping it off for VBox and having no issues on both Win10 and previous versions of Win11. I intend to keep this PC past the Windows 10 end of life in 2025 though so I figured I'd have to ditch Windows 10 eventually, and who knows if Win11 upgrades will be free forever.

My PC does not meet the Win11 requirements (just CPU).

Yes, I know VBox does not formally support it Win11 yet. I am running Windows 11 21H2 22000.527 (the new version with Windows Subsystem for Android). Alright I'm going to be honest about a few things upfront:

Virtualbox windows 10 laggy