[ https://issues.jboss.org/browse/DROOLS-2361?page=com.atlassian.jira.plugi... ] Sidi Mohamed EL AATIFI updated DROOLS-2361: ------------------------------------------- Description: This is a JVM https://bugs.openjdk.java.net/browse/JDK-6378256 bug has been fixed in JDK 9 It's not a bug in Drools but will be affected severely if using Drools for serious workloads. in my case 40% of CPU usage was to _java.lang.System.identityHashCode_ used by org.drools.core.common.DefaultFactHandle#determineIdentityHashCode UPDATE: One possible solution is to introduce new (optional) interface for identityHashCode that can be implemented by user facts and internal facts. and provide identityHashCode backed by native (fast) hashCode was: This is a JVM https://bugs.openjdk.java.net/browse/JDK-6378256 bug has been fixed in JDK 9 It's not a bug in Drools but will be affected severely if using Drools for serious workloads. in my case 40% of CPU usage was to _ java.lang.System.identityHashCode_ used by org.drools.core.common.DefaultFactHandle#determineIdentityHashCode UPDATE: One possible solution is to introduce new (optional) interface for identityHashCode that can be implemented by user facts and internal facts. and provide identityHashCode backed by native (fast) hashCode -- This message was sent by Atlassian JIRA (v7.5.0#75005)