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f33e652
(Get the code!)
I have confirmed the source of this problem stemming from Ubuntu's update of libx11-6 from 1.0.3 to 1.1.1, which notably added the new dependency of libxcb1 and libxcb-xlib0 - the problem stems somewhere within these three packages, most likely related to xcb.
Steps to reproduce:
1. Boot Ubuntu Herd 4 LiveCD (uses Xorg 7.1 w/libx11 1.0.3-4ubuntu1), noticing normal performance with minimizing and maximizing.
2. Invoke "sudo apt-get update", "sudo apt-get install libx11-6"
3. Note that libx11-6 gets upgraded to 1.1.1-1ubuntu1, and new dependencies are installed: libxcb1 and libxcb-xlib0 1.0-1.1.
4. Restart gdm (pkill gdm; sudo gdm), and notice choppy minimizing animations.
Using Herd 4 I tried selectively upgrading packages, including all xorg 7.2 components, metacity, nautilus, etc., but libx11-6 (w/xcb dependencies) is the only package that introduces the slowness.