I have a MacBook with 2 GB RAM, about 6 months old (when I switched from PC to Mac). Firefox takes 52 bounces to open for the first time after a reboot. Thunderbird and Dreamweaver take 10 each. Upgrading to Leopard didn't change anything in this regard. On a PC I would know what to do to clear caches and speed things up, and would eventually reinstall the OS (the only thing you can do on a PC). What maintenance items should I do on OS X to speed things up again? Thanks!