compiz team mailing list archive

[Daniel van Vugt <vanvugt@xxxxxxxxx>]

Compiz is not a "window manager" in the traditional X11 sense.
Technically unity-window-decorator is the window manager in Ubuntu.
Compiz is a compositing window manager, which despite sounding similar
is very different.

Compiz is responsible not only for the desktop effects, but for
rendering every pixel of every window on the screen. All rendering is
proxied through compiz so it can apply any effects to any part of the
screen. So that's why compiz uses some CPU while any part of the screen
is changing.

But I'm sure compiz could do better, which is what this bug is all
about. Certainly an unchanging desktop should result in compiz using
zero CPU. And there are probably more parts of compiz that can be
optimized to use less CPU. If only someone has the time to look into
this bug more closely...

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https://bugs.launchpad.net/bugs/803943

Title:
  compiz consuming a lot of cpu

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