Hi all, Interesting thread you got here. I would like to ask if you tried, and if not, to suggest you to try caching the RuleBase instead of the working memories. The reason is we design JBRules to support rulebase sharing, but working memory should be so cheap to create that no synchronization should be needed... just create a new working memory every time you need one (when working with stateless working memories). This would allow you to avoid the synchronization code and the cost of retracting the fact from the working memory. Let me know if you tried that already or want me to help with it. []s Edson View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3988948#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...