Why is Firefox 4 and 5 slower than firefox 3 in Mac OS X Snow Leopard?

You told me Firefox 4 was fast, so I upgraded from the latest release of 3.xx. Immediately I started seeing a pinwheel mouse cursor when I had more than about 5 or 6 tabs showing (the pinwheel is the Mac OS X equivalent of the Windows hourglass, at least in Snow Leopard). I have the latest release of Firefox 5 and I'm still seeing pinwheels.
This happens several times a day, but not every time Firefox opens. It usually takes a few minutes for the pinwheel to show up. When it gets to where the pinwheel appears to be permanent, I Force Quit Firefox and restart it, and that helps for a while.

Did you want me to re-post this in that forum or can one of the mods from here move it?

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