Comment 137 for bug 803943

this is affecting me too. Compiz goes mad upon opening chromium.

12.04, 2:8.960-ubuntu1 amd graphics driver. (4000 series gpu).

Changing Vblank in CCSM doesn't improve the CPU usage. Nor does making amdccle wait for vertical refresh.
Enabling tear free desktop does not have any affect either.
Nor does enabling/disabling catalist AI.

Without Vblank however the dash is MUCH more sluggish, to the point of not being usable.

Attached is the messages from a stock unity configuration when launching chromium, I think some of it may help.