Different execution modes is something that will be worked out in one of the next versiosn (ie 4.x). Do note that the use cases for business procecess with no persistency are extremely limited. You're talking more about modeling algortihms then instead of business processes, where generally one thinks in minutes, hours, days or even months. In-memory execution is not an option in these cases. I did a performance test of jBPM3 in the past: http://www.jorambarrez.be/blog/2008/04/14/short-jbpm-performance-showdown/ As you can see, even with persistency jBPM3 was fast imo. Do note that 4.0 is a first release, where stability and use case coverage is the goal. Performance will certainly be tackled in the coming months. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4237269#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...