How to improve Firefox rendering speed?

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http://forums.fedoraforum.org – Any tips to improve rendering speed in Fedora? I notice it's very, very slow compared to Firefox on Windows, and Safari on Mac. I know my hardware is quite old, but it should behave similar to Windows... Thinkpad T42 Pentium M 1.7Ghz 2GiB RAM ATI Radeon 7500 Mobility 32MiB 320GiB HD@7200rpm (HowTos)