We haven't produced any scientific results and won't publish any until we can do them properly (hopefully before GA), but we have done some ad-hoc tests, to give you a taste: Performance very much depends on your hardware. Using a single quad core Xeon server with 16 GiB RAM and SAS hard drives as the messaging server we can currently hit around 50K *persistent* messages per second, each message is around 1100 bytes in size, that's a data persistence rate of around 60MiBytes/sec which is *very* fast. We hope to push that to around 100MiB/s which is close to saturating the disk's max physical write rate. For non persistent messages, on a single server I did about 350K small messages per second (empty bodies) and IIRC around 100K 1100 byte messages per sec. I don't want to be more specific than that right now, since the above results are not very scientific but they should give you an indication of what JBM 2 is capable of. Why not try it out yourself? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4236750#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...