Why Windows 2000 and XP Virtual Machines in Vitrual Box are running slow or have a black screen on Windows 10

 So, I have changed settings of machine to 1 CPU and 3.5GB RAM
than did:
- memory integrity off
- DeviceGuard via gpedit - off
- regedit - HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\SystemGuard - all "0" values
- bcdedit /set hypervisorlaunchtype off
- shutdown -s -t 2

https://forums.virtualbox.org/viewtopic.php?t=110203