In the recent 10 year when discussing java and/or garbage collection, the only performance penalty that I have not been able to defend is that garbage collection algorithms more
In this day and age, paging programs is a really bad idea. Memory is very cheap.
FWIW, if you are running on a PC from a manufacturer that likes to charge several times over the odds for memory, Windows Vista has a predictive paging algorithm that works quite well (perhaps the only thing that OS does do well).