What I fail to understand is where the lock contention comes from. Given that each thread access separate nodes and mutate only attributes, why is there a contention on state transfer? Ie. given thread T1 accessing node N1, state transfer for N1 should not commence unless T1 accesses the data on cache2 in which case no thread is accessing N1 on cache1. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4152739#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...