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0f7b58d
(Get the code!)
I don't think it is Compiz as I have this problem and compiz is not enabled.
I no longer get this problem while tabbing (even in firefox - this does eventually push the CPU up to 100%), but when something ram intensive (like hugin stitching photos together) is occurring there is lots of stuttering.
I am still waiting for the new kernal etc. to make it into the normal updates/backports repository - is that likely to happen in the near future?
There might be something in Xorg - It seems to take longer to render windows than it used to.
But you are probably right - It might be bigger than just pulseaudio - but hopefully the next version of pulseaudio will fix the problem and hide the other bugs until later :-)