Apple has just placed at your disposal, at the moment only via software update, an update of OSX bringing us to 10.5.4. As usual Apple give a very detailed description:
The 10.5.4 Update is recommended for all users running Mac OS X Leopard and includes general operating system fixes that enhance the stability, compatibility and security of your Mac. .
Safari will certainly be more speedy after this update
[translation by crispin]
