Compositing and “lightweight” desktops

In the general discussion about “lightweight” desktop environments I have read a few times that one should disable Compositing in KWin. That’s done in Kubuntu’s low-fat settings package and also something Jos talked about in the context of Klyde. I have never seen an explanation on why Compositing should matter at all. It mostly boils down to “OpenGL is evil” and “I don’t want 3D”. So let’s leave the “educated guesses” behind us and have a proper look to the question whether Compositing matters for “lightweight”. (Remember: lightweight is a buzz-word without any meaning.)

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