Public bug reported:

Binary package hint: compiz

When using compiz on dual head systems context/popup menus and
maximising are delayed on the first screen by approximately 3 seconds.

This seems to be a common problem : 
http://ubuntuforums.org/showthread.php?t=536045&highlight=compiz+slow+menus&page=2
but I couldn't find it listed as a bug.

I can confirm it isn't effected by changing the fade-menus delay in
compiz (or even turning it off entirely,) and it's not altered by
changing the gnome menu delay in gconf. It does not seem to be any thing
to do with CPU usage / video memory as both stay quiet during the delay.

It also only happens with GTK applications, KDE apps like amarok run
without any delay on both heads.

This used to happen with Beryl when you loaded it on a dual head setup
using --no-context-share, and was solved by running two instances on
beryl for each screen. However compiz appears to no longer has this
option, nor does it seems to respect the -display :0 / -display :1
options.

Thanks, and apologies if I have duplicated a bug.

-
My setup:

Gutsy beta, last updated 6th October, bug still present.
(Compiz 0.6.1)
Using two nvidia cards with nvidia driver. (although from forum posts, this 
doesn't seem to be exclusively affect nvidia users.)

-

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: New

-- 
slow gtk popup menus with gtk dual head
https://bugs.launchpad.net/bugs/149764
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