this is what i adde dto my own serevrs startup batch/script
-XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSIncrementalPacing -XX:ParallelGCThreads=3 -XX:+AggressiveOpts
might help Once you move it to an external Machine. seems to help client side too but adjust per avilable threads otherwise...