What I found was a JavaScript comparison: http://www.raymond.cc/blog/mozilla-f...ared-to-32bit/
Generally, the 32 bit and 64 bit numbers are very close, with a slight edge for the 32 bit variant. Which is kind of expected given the experience with 64 bit Java & co.
Page rendering speed on 64 bit might benefit from SSE instructions in pixman, but a quick Google search turned up no meaningful comparison here. You'll have to benchmark that yourself.



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