Some of you may have noticed that the Firefox 3 nightly builds have felt a lot snappier since a few weeks ago.  There's an interesting story in that, one that I finally have time to write up.  We've had a number of bugs on the Mac where people were complaining of bad performance compared to Firefox 2, usually involving a test where a page was scrolled by a small step 100 or so times, and the time from start to finish was recorded.  In many of these tests, Fx3 was coming in at 50% to 500%+ slower.  This was odd, because in theory the graphics layer (which is what scrolling is mostly exercising) in Firefox 3 should be faster, given that it's talking almost directly to Quartz.
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