"Icon translucency during drag-n-drop should be supported even on 
non-compositing WMs."
We cannot do that. We need a compositor to use the RGBA colormap for the 
dragged icon so that we can make it partially transparent. Historically, 
Nautilus had code that tried a different path towards this end, but the X 
server was never able to keep up, making it incredibly slow and that code path 
would be even more unreasonable for people without hardware accelerated servers 
than the current approach.

"Another alternative would be to see this bug as a request for compositing 
turned on by default in Ubuntu's Metacity."
Metacity's compositor is very young, it's slower than the competition due to 
using XRender instead of OpenGL (though it is still very reasonable; it 
performs quite well on my hardware at least) and is still considered 
experimental. You should file the video bug against Metacity's compositor 
upstream, though it may be a problem with your video card and/or drivers. The 
Metacity developers would know better than I would for certain on this, though.

On the other hand, Ubuntu already ships with Compiz turned on by default
whenever possible, making this feature accessible to as many people as
possible. I'm not sure how much more we could be doing in this regard.

-- 
Opaque nautilus drag-n-drop for users without HW GL Acceleration
https://bugs.launchpad.net/bugs/259259
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