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Well, for one, it usually is much more energy-efficient: longer battery life, cooler computers, and more responsive under heavy (CPU) load.

Other people have different hardware and different goals. A year or so ago I worked on a Linux laptop that was dog-slow. If I didn't enable GPU-rendering for the UI, it competed for the very limited CPU.

Using less power is generally the main benefit. On lower end hardware you may also notice a performance difference, depending on what the UI is trying to display.

composition with transparencies is the main one