They are slow and inefficient especially in a VM where there is no GPU. It doesn't make sense to redraw all screen if only one button has changed.

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slopinthebag 2 hours ago | parent [-]

retained mode frameworks still redraw the whole frame typically, unless they're doing some type of partial rendering - that still has a cost though, and all modern ui frameworks retained or not will suffer without a gpu.

in practice rendering a frame of imgui or whatever is so fast and efficient that it's not an issue. we're talking a few thousand triangles and typically a small handful of shaders & draw calls.

	▲	codedokode an hour ago \| parent [-]
		How fast are shaders on CPU? Shaders are garbage. I remember many years ago I tried Ubuntu in a VM and it decided to use llvmpipe for rendering. There was a 30-second lag between clicking on anything and seeing the result. Since then I hate GPU-based GUIs.