OK, well, just for fun I compiled BitchX side by side on the following two machines:
In the blue corner, a PM G4 733 with 640 MB RAM running OS X 10.2 (Jag).
In the red corner, an AMD K6-2 500 with 128 MB RAM running FreeBSD 4.6.2.
Well, I ran the configure script and the AMD won by...