14 DAY TRIAL // Canonical is working very hard to close the gap in performance between the Mir and X display server – at least this is what we gather from Mir developers.
Mark Shuttleworth has gone on record saying that Ubuntu on Mir seems to be faster and smother than the X counterpart, but Canonical's engineeres are aware that a 20% performance drop is demonstrated by Mir.
“One of the bugs that people have noticed is a 10-20% performance drop over raw X. This is really several bits of missing functionality – we're doing a lot more work than we need to be.”
“Oddly enough, people have also been mentioning that it feels ‘smoother’ – which might be placebo, or unrelated updates,” said Canonical's Christopher Halse Rogers.
Whatever the case may be, Canonical is determined to provide a working display server by Ubuntu 13.10, and they seem to be on the right track.