I saw a terrible fps drop between feisty and gutsy, it was due to a irq 
conflict (see bug n°155985)
I solved this by booting with options pnpbios=off irqpoll
maybe it could help ?

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Drastic Framerate drop in Gutsy Beta Compared to Feisty in glxgears [i865]
https://bugs.launchpad.net/bugs/146695
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