My (HP laptop) keyboard also causes the lag on notify-osd, and it's
particularly bad when at minimum or maximum volume -- it's actaully
faster to kill notify-osd than to wait for it to stop spazzing.

I have attached a log of my keyboard behavior ( xev | grep --line-
buffered KeyPress | ts %.S | tee keyrepeat.log ) -- as you'll see, it
repeats every 0.05 (1/20) second or so.  It seems notify-osd can't cope
with this rate of key repeats... and because notify-osd lags at
displaying the volume change, the sound volume itself lags at changing.
That's an entirely different issue, however (and it's synchronous "by
design").

** Attachment added: "keyrepeat.log"
   http://launchpadlibrarian.net/34337031/keyrepeat.log

-- 
notify-osd is losing performance
https://bugs.launchpad.net/bugs/367049
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