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Virtualbox image downloaded from microsoft

My HOST machine windows version: 1909 (build 18363.752)

SVM enabled in BIOS. Tried with enabled and disabled Hyper-V feature - same effect

This is probably becasue "Enable Nested VT-x/AMD-v" is not enabled. But it's actually greyed out. And if I turn it on via command line it gives me error, that it can't start VM at all:

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Failed to open a session for the virtual machine WinDev2003Eval. Cannot enable nested VT-x/AMD-V without nested-paging and unresricted guest execution! (VERR_CPUM_INVALID_HWVIRT_CONFIG). Result Code: E_FAIL (0x80004005) Component: ConsoleWrap Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed}

Attaching logs, w/o this checkbox and when VM is unbelievably slow. I was not even able to wait until it shows me login screen.

imcono wrote: This is probably becasue "Enable Nested VT-x/AMD-v" is not enabled.

No. Unless you're trying to run a VM inside a VM, you don't care about nested VT-x/AMD-v. VirtualBox 6.1.4 no longer gives you an option to run the host VM without VT-x.

00:00:01.393204 HM: HMR3Init: Attempting fall back to NEM: AMD-V is not available
00:00:01.402324 NEM: WHvCapabilityCodeHypervisorPresent is TRUE, so this might work...
00:00:01.402331 NEM: WHvCapabilityCodeExtendedVmExits = 0x0000000000000007

This is your actual problem: Hyper-v is running on the host, and makes the VirtualBox VM run very slowly, if at all.

Related FAQ: I have a 64bit host, but can't install 64bit guests, especially posts #2 and beyond.

Thank you!
This tip helped:

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On some Windows hosts with an EFI BIOS, DeviceGuard or CredentialGuard may be active by default, and interferes with OS level virtualization apps in the same way that Hyper-v does. These features need to be disabled. On Pro versions of Windows you can do this using gpedit.msc (set Local Computer Policy > Computer Configuration > Administrative Templates > System > Device Guard > Turn on Virtualization Based Security to Disabled. CredentialGuard is a subset of DeviceGuard, so disabling the former should be enough. If you cannot use gpedit for some reason then the equivalent registry hack is to find the key HKLM|SYSTEM|CurrentControlSet|Control|DeviceGuard|EnableVirtualizationBasedSecurity|Enabled and set it to 0.

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Win10 VMs with Virtualbox very slow on AMD Ryzen 9 3900X

Win10 VMs with Virtualbox very slow on AMD Ryzen 9 3900X

Re: Win10 VMs with Virtualbox very slow on AMD Ryzen 9 3900X

Re: Win10 VMs with Virtualbox very slow on AMD Ryzen 9 3900X