Beefier display modules will have a framebuffer inside so you don’t have to mind the timing, even if you still have to transfer the image line by line because a

Beefier display modules will have a framebuffer inside so you don’t have to mind the timing, even if you still have to transfer the image line by line because a full screen buffer (at the full colour depth) may not fit into the microcontroller’s own RAM. It would actually be interesting to do some sort of IMGUI for this kind of environment, that would perhaps rerun the display function multiple times per screen update, once for each line where a widget’s bounding box starts or ends.