The time data is all on the X axis. Either you have not set up a second scale for the Y axis for that data (don't ask me how to do this, I'm not a Excel expert), or you have not provided a high enough factor (I cover this in my description of building the chart, using a factor of 10000 or 100000, depending on the pause-time ranges). [I really need to come up with new scripts that plot the pause time ranges for minor and major collections... Yet another task to do in copious spare time.] Also, look at the pause times for the full collections and give me an idea of what their ranges are. Yes, CMS is the Concurrent Mark-Sweep collector. Regarding the 500 users in the SLA - is that logged in users, or simultaneous active requests? I ask because in general you can figure about 1 active request for every 10 logged-in users. Is there any think time in your load testing script? I still think you need to go with the higher memory settings. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4258702#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...