[DC-3]

I hardly think that Mutter is the be-all and end-all of Wayland compositor performance. I could see Ubunu plumbing a re-moulded Mir back into their distribution further down the line (while keeping the rest of the GNOME environment). I'm not certain on the technical details, but I believe this should be possibly; for Wayland was certainly designed with compositor agnosticism in mind.

Edit: reading further, it appears that GNOME Shell is quite tightly woven into Mutter, which may well complicate matters.

[simion314]

GNOME devs realized already that they have problems with the current architecture, I think X got the blame though this time too, so they plan a GNOME4 version, I do not know if they started coding it or are just in planing phase.