Disable logout effect ("gray-out" of windows)?

[Toralf Lund <toralf procaptura com>]

I'll try this one again (no response last time):

When pressing the Log Out button in GNOME, the entire display is redrawn 
with a special effect (while the logout confirmation dialog is active) 
to indicate an "insensitive" desktop (as we all know.) This is rather 
nice for a local display, but if you log in to GNOME via a remote X 
server, the update takes forever. Is there any way to disable this effect?

- Toralf