Sweet, I thought everyone knew about this option. If you have a lot of RAM (i.e. like 1GB), use these options (as I have been using them for a while and they seem to work great).
Use for OpenOffice.Org 200MB
Memory per object 10MB
Remove from memory after 00:10 hh:mm
Number of objects 20
Thanks DerekKraan for bringing this up.
Cheers,
Wraven