I'm not sure if the following is the same slowness that the original bug
describes, but I experience this. With Ubuntu 9.04 on Dell laptop with
intel graphics, do the following:

1. Press and hold the "volume-up" button. Hold it long enough for the
key auto-repeat to register more than 20 repeats, say.

2. Release the volume-up button.

3. Watch the volume on-screen-display. It slowly, slowly responds to
each on one of those 20 repeats. Each response takes about 1/2 to 1
second. Each response is not smooth (the osd is supposed to "glow" up
and down, but it changes in irregular steps). You can sit and watch it
for 15 seconds.

4. During all this time "top" shows that notify-osd is using about 89%
of one of the two CPU cores.

This happens both with metacity and with compiz.

It really makes the volume-control on my laptop completely unusable. The
user needs to be able to press and hold the button and simply release
the button when the volume is at the desired level. This is impossible
because of the slow response to each key-repeat.

-- 
notify-osd is very, very slow
https://bugs.launchpad.net/bugs/367049
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