My results were when using AS623 (5.6.0) on a 2GHz P4 with 512MB RAM. The data structure was a HoHoHoHoHoHoA (a total of approx 2.4M elements over ~ 600000 arrays), but sharing the RAM with a Oracle database (about 150MB resident in memory). Watching the datastructure destruct I saw 140000+ page faults. I'm looking to move the software to a Linux box, Perl 5.8 and put the DB on another box, and see how long things take.