Hello PeterJ, thank you very much for the quick reply and your advice! "PeterJ" wrote : | 1) ... some standard benchmarking apps | are there specific benchmarking tools for Seam/RichFaces? which would you recommend? "PeterJ" wrote : | 2) What transaction isolation level are you using? ... best with optimistic locking. I have tried the setting 2 and versioning. Optimistic locking causes lost clicks of the item counter through overwriting.. Well, I should go with it to the Hibernate folks. But I have a feeling that my transactions (which equals in a default setup to a page load?) take too much time, therefore the conflicts. "PeterJ" wrote : | 3) What min and max pool sizes did you specify in the *-ds.xml file? The default is 20. I have tried different settings, from more than 20 to hundreds which I do not think to be optimal?.. Btw I used c3p0 settings in the persistence.xml "PeterJ" wrote : | 5) What database are you using? MySQL 5.1.; do I need InnoDB tables if using versioning? kind regards View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4255411#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...