"clebert.suconic(a)jboss.com" wrote : | Another point also... Making ClientProducerIimpl to use nonBlocking on transacted sends, made those to be much slower on my computer. It is taking about 200 msgs/second against 2000 as it used to be when sending blocking. Very strange. Did you run ant perfSenderTransactional and ant perfListenerTransactional? They high performance on my machine. Can you report your results? I suspect something else is going on there. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4150936#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...