I should restate that this problem absolutely only occurs when two monitors are enabled. If I disable the second monitor and perform the same tests, there is absolutely no change in performance. Did you conduct your testing with two monitors?

On 02/12/11 13:10, Jasper St. Pierre wrote:
Does the issue exist if you run raw mutter? I can't reproduce the
issue here with mutter or with gnome-shell. There's no performance dip
if I lock the screen or change the wallpaper.

The code that handles the wallpaper is here:

     
http://git.gnome.org/browse/mutter/tree/src/compositor/meta-background-actor.c

You can see that it tries very hard to make sure that it's not holding
onto the pixmap any more than it needs to.

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