[KevinH]

FWIW, on my Manjaro box which is Arch based and updated this morning, I ran the tests with and without restarting and never touching the AppImage. Always launching from the command line. No change, both are fast. But this is in a linux machine with a radeon graphics card.

It is interesting that a web search says that the linux current nouveau driver does support GBM (and has long done so) and so do the latest nvidia supplied proprietary drivers. It is only the older proprietary nvidia drivers that do not support GBM.

Also it seems there is an additional vulkan-nouveau package you can install if you are using the nouveau that will add accelerated vulkan support.

@RbnJrg, You might try installing that vulkan-nouveau package to see if that helps.