Also of course it depends on what needs to be rendered. I didn't deep-dive yet 
into the internals of it, but isn't it that when combining the images at the 
end, that transfer of the initial images with lots of data basically happens 
only once? It seems to me devdraw can be quite performant on certain use cases. 
(UIs with basic shapes) But true, having access to the framebuffer should offer 
more options. Also I wonder what kind of functions it should be providing. (And 
if devdraw couldn't be just made faster)

> What I suggest is a lower level interface to use the framebuffer directly and 
> I think devdraw (memdraw, memlayer) is too high level and rio oriented. ... 
> Also the transfer of images in this way is expensive (regarding time) a 
> screen image is at least copied two times. So by defining a lower level we 
> could improve the performance of rendering by a factor of two.

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