[ubuntu] Tips to speed up an old computer?

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http://ubuntuforums.org – Hi guys, We've got a really cruddy old computer that I've set up as a guest computer for our Bed and Breakfast with Ubuntu 9.10. It's usable, but not over the moon fast. What can I do to improve its speed, without making any hardware changes or spending money? I've considered putting Xubuntu on, but I've taken a year to learn the Gnome environment well so I'd prefer to stick with what I know... for now! Specs: Pentium III 700MHz (Coppermine) CPU 512MB SDRAM 8.7GB HDD Intel 82815 Chipset Graphics Controller Intel AC'97 Audio Controller DSE 19" LCD @ 1440 x 900 Thanks in advance :) (Hardware)