It isn't using 4096 images though it does use a GuiDrawingPanel which draws at a limited rate (as you'll see if you go look at it) then turns it into a png file
Stefan says saveimage is messed up right now so I cannot yet script it to load the files the player already has...
But in the end it will render the map, save to a png, then load from that point on until it needs to update again!