I once got LWPro 4.08 to run for 36 hrs. but that is a record. The usual length of time is about 1.5 hours. The program is very memory hungry and uses over 80% of my 1.5MB ram on a 1.25 GHz PowerMac. The program is very slow to react to clicks and keyboard entries. I suspect that the overhead of Java eats up so many machine cycles that the processor/memory can't keep up. I think that optimization for the displayed page would help but that doesn't seem to be happening yet.