Just an idea I head before...
On Thu, Jul 05, 2018 at 02:15:09PM +0200, Norman Feske wrote:
Would it be faster to set the size of the nit_fb from outside (kind of like it is done when the window is resized)?
No. The resize mechanism of the window manager is quick.
[...]
It may be worthwhile to add code to the VirtualBox console that centers virtual framebuffers in the used Framebuffer session on a black background. This would look nicer in the boot phase and would also instantly act on window size change (before the guest is able to adapt).
Greets