If you've got some time that you have to spend away from your computer (say, you're leaving it to go to Northern Wisconsin for a few days), may I suggest the following
# Build configuration script
# See http://www.mozilla.org/build/unix.html for build instructions.
# Options for 'configure' (same as command-line options).
Since I don't have a printer, I use CronosII for mail, and some tin variant for news, the time you spend optimizing the living hell out of the code is almost gained back by removing debugging features and stuff I never use. I had no idea, that Mozilla could be so fast - like I can actually FEEL that I'm connected to a T1, and click on a page, and it doesn't churn/sputter/render for a while. It just happens. And so far, it's been pretty stable (9.9, anyways). Thank you Mozilla . . . thank you. When I have another spare day away, I think I'll add the expensive optimations to the optimization flag.