If we use Oracle VirtualBox, it is necessary to disable Hyper-V, since the virtual machines are very slow. We open a CMD window as administrators and run:
bcdedit /set hypervisorlaunchtype off
A reboot is required for it to work.
If we want Hyper-V to work again, it is necessary to execute this other code: (For example to run Windows SandBox).
bcdedit /set hypervisorlaunchtype auto
A reboot is required for it to work.