Galder, I ran one test configuration (OL, INV_SYNC, lazy=true) in hibernate with the GC options you mentioned and results are not as good when not using these options. I am running other configurations and see how it looks like. I will update you all. Just to make sure, this is what server startup looks like: java -server -Xms3072m -Xmx3072m -XX:MaxPermSize=128m -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+UseLargePages -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000 -Djgroups.udp.ip_ttl=1 -jar /tmp/pjha/eap43-portal26/bin/run.jar -c production -b 10.18.1.131 -Djboss.partition.name=PortalScalabilityTestPartition -Dcluster.route.name=perf13 -u 239.11.12.13 -Dsf.pid=FR5VbgAgyO09Z8vq | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4170794#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...