[raphlinus]

Windows is actually pretty good about doing incremental present, only writing the composited regions that have actually changed. But macOS is bad at this, so people have to fake it in ugly ways to reduce power consumption. It's especially bad when all you want to do is blink a cursor.

Whether apps make use of these capabilities are another question. It's pretty easy to get lazy and blat out the whole window every time, when you know the GPU can handle the pixel bandwidth, and things like imgui explicitly make this tradeoff to keep logic simple.