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1b1ed1a
(Get the code!)
Ok, home now to do some testing. I somehow forgot that Unity is silky smooth on my desktop Phenom II X4 955 and nVidia GTX260. I have "Detect Refresh Rate" disabled in Compiz, and set the refresh to 120. Terminals and other windows move around very smoothly, including in Expo mode. ..... EXCEPT when Quanta Plus is running. All of a sudden, performance drops to the jerky behaviour described here.
On the HP DM1-3010AU (AMD Zacate E-350 APU, dual core 1.6GHz with Radeon 6310 on die, 2Gb DDR3-1066, 1366x768 screen), with the Catalyst driver it's jerky, and even worse when Quanta Plus is running.
Personally I feel there's a big clue in Quanta making things so much worse, but I'm not skilled enough to figure it out past there. Of note though, moving a terminal around (on the Phenom II) sees compiz use 6-10% of an 800MHz core. While Quanta is running, moving that same terminal causes compiz to use 66-80% of a 3.2GHz core. Has to be something there to help figure this bug out..