I started the Test Client on an XP2100+ at stock this morning (now 15 hours ago) and it seems to be both faster, despite more structures per gen, and getting lower energy results.

I've now copied it to another 3 boxen, XP2000, XP2400 and Celeron 2.2 to see if the results are coming through on all fronts.

So far so good. If it proves to be stable and as good as it looks to be, I'll move the rest of my boxen over to the new client/back to DF