> I was using -Xms256m -Xmx1024m. Tried with -Xms1024m -Xmx1024m, again > without any noticeable difference. What's "top" look like after running this for a minute or two? You said you had 1G = 1024MB of RAM; trying to have a heap of 1024m you may be swapping like crazy, if so try with 600m to 800m. - Arne H. J.