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The rendering is on the GPU but the description of the UI is created and executed on the CPU, and then the results are sent to the GPU, is that right? In other words, it works a little like a video game.

Yes, you describe your UI from the CPU code and it gets accumulated into a draw list. Differents backends (OpenGL, Direct X, Metal ...) sends them to the GPU for display. It's close to what a game is doing.

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