Tip to speed up firefox's page rendering.
:config" in your FireFox address bar. The settings you're looking for are:
browser.turbo.enabled - set this to true
network.http.pipelining - set this to true
network.http.pipelining.maxrequests - set this to 32
network.http.proxy.pipelining - set this to true
Or you can download extension to firefox called "Tweak network settings",
more info at: http://www.bitstorm.org/extensions/
Enabling the pipelining features allows the browser to make multiple requests to the server at the same time. The "maxrequests" is the maximum number of requests it will send at once. I've heard that 8 is the most it will send at once, but setting it higher won't hurt, just in case.
Adjusting those settings will help pages render much faster in FireFox. In fact, my own observations have been that, tweaked in this manner, FireFox will render faster than Opera (and yes, I realize that others may experience different results).