This is an interesting thread at Ars Technica that I saw someone post elsewhere. Pretty interesting, and some seriously funny code .
Panther Automatically Defrags
Panther Automatically Defrags
Originally posted by Marble
While the Panther UI and generally snappiness is much faster, I've found that using the journaled filesystem on my 4200rpm notebook hard drive causes noticeable lag when I'm moving files from directory to directory, to the trash, etc. It actually takes about one second between hitting command-delete and actually seeing the icon disappear from my finder window with the little "clink" sound. With journaling disabled, the process is instantaneous. I wonder if this has something to do with it?