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.