A reminder for me to check out this page for some hints on improving Ubuntu performance...
How to tune your Ubuntu PC for faster performance
EDIT: Well, turns out the page is an exact duplicate of a page I found elsewhere. Not sure who's ripping off whom. Anyhow, the adjustment to "swappiness" from 60 to 10 seems to have helped (edit /etc/sysctl.conf and change swappiness setting), as has the setting to allow faster booting and enable some multithreadedness (edit /etc/init.d/rc and make "CONCURRENCY=shell"), but the most impressive one was freeing up some RAM. The method has changed, though: this thread in Ubuntu forums describes what you do to turn off tty2-6. It reduced my RAM usage from 40% to 20%! (You basically edit /etc/default/console-setup file and change a line to "/dev/tty[1-2]", then go to /etc/event.d/ and edit the tty files that you DO NOT want by commenting out lines starting with "start on runlevel").
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