This behaviour occurs in exactly the same situations as another bug that
I have filed separately as #172502.
--
Compiz + separate X server multi-head nvidia setup = GUI responses delayed by
1 second
https://bugs.launchpad.net/bugs/172503
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This only happens with menus in gtk applications and only when using
multiscreen with nvidia and compiz. Not sure where to put it so I'm
assigning this to gtk since it only happens to apps that use it. Does
this also happen if you use xcompmgr with metacity?
** Changed in: gtk+2.0 (Ubuntu)