Hyperthread Prossesor Q

Since I'm stuck for a while with my current computer, (upgrade at xmas
)....I have a DELL Dimension 8400 with a 3.4Ghz, P4HT .....got it right before the real dually's came out ::)
Besides all of the NickN tweaks, what else or is there, that I can do to improve performance? I searched a bit, but really couldn't find anything...learned a bit about HT..........
Any suggestion's, besides get a new rig?

Besides all of the NickN tweaks, what else or is there, that I can do to improve performance? I searched a bit, but really couldn't find anything...learned a bit about HT..........
Any suggestion's, besides get a new rig?