If this is visible, Virtualbox uses components from Hyper-V, with which, for example, the Windows Sandbox also runs. If you take a closer look at the virtual machine window, you might see a turtle icon in the lower right corner. Oracle did not place this notice for fun (c) PCtipp.chĪlthough my accusation of “no indication” needs to be put into perspective a little. Less nice, however, that Virtualbox never displayed a corresponding message while I was struggling with the virtual machines. The briefest text in the manual is accompanied by a note that (translated) reads roughly: When using this feature, some hosts experience significant virtual machine performance degradation. And this “experimental” is to be taken literally. Half a weekend went by before I came across an inconspicuous hint in the Virtualbox forum and in the online manual: Virtualbox also supports the Hyper-V virtualization engine included in Windows 11 (and probably Windows 10 as well) «experimentally». If it ran through once after hours, other symptoms became noticeable in addition to the underground performance: sudden reboots of the VM for no apparent reason and increasing time delays in the system clock. That should easily be enough! And yet: Whether I tried it with Windows 10 or 11 in the VM, the installation was excruciatingly slow. Thanks to a graphics card suitable for gaming, I was also able to activate 3D acceleration and allocate 256 MB of graphics memory.
I assigned 8 GB of RAM and 4 CPU cores to the virtual machines.
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