With unity+compiz from the PPA on sandy bridge graphics, I have so far
encountered one instance of degradation (but it's nowhere near as bad as
before).

The degradation is that I see some tearing when moving a window around
(which no longer happens immediately after login) and occasionally the
window 'freezes' for a second before jumping over to where the mouse now
is.

glxspheres is doing something similar: it reported 59, 59, 42, 59, 59,
42, 59, 59, 42,... ie every few seconds it was stuttering and losing
framerate, then recovering.

A minute later I still see the tearing but glxspheres seems to have
totally recovered. The 'freeze' when moving a window around is also much
improved.

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https://bugs.launchpad.net/bugs/888039

Title:
  Gradual degradation in desktop performance.

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