[Solved] virtualbox runs slow

[winxpto10]

Recently I upgraded from Windows 10 version 1809 to Windows 10 version 21H2, the virtualbox runs slow. I did clean install Windows 10 version 21H2 still virtualbox runs slow with latest windows updates installed and latest version all drivers installed. I am using latest version virtualbox

[scottgus1]

Start the VM from full normal shutdown, not save-state. Run until you see the problem happen, then shut down the VM from within the VM's OS if possible. If not possible, close the Virtualbox window for the VM with the Power Off option set.

Right-click the VM in the main Virtualbox window's VM list, choose Show Log. Save the far left tab's log, zip it, and post the zip file, using the forum's Upload Attachment tab.

[winxpto10]

Here it is

[BillG]

It seems that you have somehow enabled Hyper-V on the host.

Code: Select all

00:00:03.177328 ********************* End of CFGM dump **********************
00:00:03.177386 HM: HMR3Init: Attempting fall back to NEM: VT-x is not available
00:00:03.229697 NEM: WHvCapabilityCodeHypervisorPresent is TRUE, so this might work...

See this post. viewtopic.php?t=99390

[winxpto10]

How do i disable Hyper-V on the host?

[scottgus1]

How do i disable Hyper-V on the host?

By reading BillG's post fully. There's a link to click on.

[winxpto10]

Ok, i did enter bcdedit /set hypervisorlaunchtype off in command prompt as administrator and successfully, i do not need to enter DISM /Online /Disable-Feature:Microsoft-Hyper-V in command prompt as administrator is that correct?

[BillG]

That will be fine as long as your reboot at least once after you enter the hypervisorlaunchtype command. if the hypervisor does not load, any programs which depend on it cannot run, even if they are enabled. It is a killswitch for Hyper-V, if you like to think of it that way.

[winxpto10]

problem solved thank you so much now virtualbox runs fast