How does Mutter differ to Compiz in terms of its resource consumption?

Solution 1:

I havent found anyone who has done a direct Mutter vs Compiz resource usage study.

Its arguable that Phoronix has done the closest to this looking recently at performance comparison between gnome-shell (Mutter), unity (compiz) & KWin using both NVIDIA and ATI graphics.

My reading of the results - and making the assumption that better performance is equivalent to less resource usage for the same work - is that gnome-shell and unity were perhaps equally resource hungry when using NVIDIA drivers, whereas gnome-shell using ATI was more resource hungry than Unity.

However, KWin was better than both gnome-shell and unity.

Usual caveats should apply when trying to interpret Phoronix results & methodologies - arguments should be directed to the Phoronix forums!