Bazzite really slow virtualbox on Windows

Hello,
I have a friend that wants to try out Bazzite, and so he installed it in VirtualBox on windows 11 to test it.
We set up VboxSVGA graphics driver, with 3D acceleration enabled and the maximum amount of video memory (128mb), he gave it 6GB of ram and 4 CPU cores.

However the os is very slow still.

What did we miss ?
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