Nested accumulate makes DRL twice as slow in statefull session -------------------------------------------------------------- Key: DROOLS-1441 URL: https://issues.jboss.org/browse/DROOLS-1441 Project: Drools Issue Type: Bug Components: core engine Affects Versions: 7.0.0.Beta6 Reporter: Geoffrey De Smet Assignee: Mario Fusco Attachments: Selection_350.png To reproduce: comment out to replace the 2 rules in this DRL: https://github.com/droolsjbpm/optaplanner/blob/master/optaplanner-example... and run TennisApp In the sampler profiling, see attachement 350, the original way does setObject() 60% of the time and determineIdentityHashcode 20%, but in the new one way it's vica versa. so the number of setObjects() calls is probably the same, it's just the determineIdentityHashCode() that blow up.