[codedokode]

I have a feeling that framebuffer must be something very slow. When I used both Windows and Linux without proprietary drivers for a video card (so they use some generic VGA or VESA driver), GUI would be slower. For example, scrolling in a window was laggy. Or dragging a window around the screen. Why it could be so? Do video card vendors intentionally slow down video memory access or is VGA or VESA some poorly designed standard?

I was not using Compiz or something like this so it cannot be explained with the lack of 3D acceleration.

Also, with generic VGA driver you cannot have 100Hz frame rate on high resolutions.