[Pulcinella]

Even before that, mobile UI frameworks are retained mode GUIs, not immediate. They aren't drawing to a blank framebuffer 120 times a second if they don't have to. Redraws only happen when something changes (e.g. "Dirty" rects).

[tuetuopay]

Oh even immediate UI framework don't paint non-stop. If the UI has not been interacted with, or if there are no animations/gifs, it has no blimey reason to repaint, and it will not. It will repaint the whole screen, of course, but that's already a win.