Did a solution/explanation come to light regarding this problem?
I've just upgraded to Mountain Lion and Firefox is now very slow. Every mouse click is accompanied by the spinning ball - even typing this short para has caused the input to pause three times with the spinning ball too. In just a few days since last boot Activity Monitor reports Page Ins at 4.66Gb, Page Outs at 4.28Gb and Swap used at 5.84Gb. Something seems serious amiss. Any clues people?
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