Resources for Gentoo Desktop Performance Tuning

Hi Gentooers. I've been playing around with Gentoo for a while, and now
comes the time to tune up things a bit, as my k6-2 500mhz cpu and 256mb
RAM are getting a bit slowy. I 've emerged gnome (which I no longer use
except for some icons and perhaps a couple of utilities), xfce4 and
icewm. The last 2 of which I'm playing with, along with ROX for file
management and desktop (pinboard).
I would like to know about pointers to guides, hints & tips on how to
tailor a Gentoo system the improve performance (e.g. what processes to
comment out, USE flags, file system issues, etc etc). Oh, forgot to
mention I'm using ReiserFS 3 fs's except /boot which is ext2.
Any help will be appreciated.
Thanks in advance!!!
Willy.
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