It's not about hardware, it seems to be something in software.

I made a quick test with my installed systems:
Mac mini 1.5: 16769
Powerbook 1.67: 15212

Seems to be in line with CPU power etc, but then why did koszer get that much better result with his Mac mini?

I booted the system from the installation ISO on both systems ( = no configurations or 3rd party software installations):
Mac mini 1.5: 4222
Powerbook 1.67: 3883

Still in line with machine specs, but MUCH quicker on BOTH setups!

But what affects on the installed systems with own configurations and 3rd party stuff? I don't know yet...