Hello Joachim, i'm not really asking for a general throughput number. I assume (hope) that JBoss does some performance testing when releasing a new version. Are the results of these tests available? The test result could describe how the application is build, on which hardware it was executed, how everything was configured,... At least there would be something to compare. Of course i can increase the permgen space. But why is this occurring this fast in JBoss 5.1.0 and not in 4.2.3 or 4.0.2? And why is performance decreasing so significantly when using an newer version of JBoss? With kind regards, Erwin View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4269242#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...