Index: drools-core/src/main/java/org/drools/common/AbstractWorkingMemory.java
===================================================================
--- drools-core/src/main/java/org/drools/common/AbstractWorkingMemory.java	(revision 29938)
+++ drools-core/src/main/java/org/drools/common/AbstractWorkingMemory.java	(working copy)
@@ -31,6 +31,7 @@
 import java.util.Queue;
 import java.util.Map.Entry;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentLinkedQueue;
 import java.util.concurrent.Executors;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicLong;
@@ -289,7 +290,7 @@
             this.initialFactHandle = initialFactHandle;
         }
 
-        this.actionQueue = new LinkedList<WorkingMemoryAction>();
+        this.actionQueue = new ConcurrentLinkedQueue<WorkingMemoryAction>();
 
         this.addRemovePropertyChangeListenerArgs = new Object[]{this};
         this.queryResults = Collections.EMPTY_MAP;
@@ -1556,7 +1557,7 @@
     public void executeQueuedActions() {
         try {
             startOperation();
-            synchronized ( this.actionQueue ) {
+            //synchronized ( this.actionQueue ) {
                 if ( !this.actionQueue.isEmpty() && !evaluatingActionQueue ) {
                     evaluatingActionQueue = true;
                     WorkingMemoryAction action = null;
@@ -1571,7 +1572,7 @@
                     }
                     evaluatingActionQueue = false;
                 }
-            }
+            //}
         } finally {
             endOperation();
         }
@@ -1582,7 +1583,7 @@
     }
 
     public void queueWorkingMemoryAction(final WorkingMemoryAction action) {
-        synchronized ( this.actionQueue ) {
+        //synchronized ( this.actionQueue ) {
             try {
                 startOperation();
                 this.actionQueue.add( action );
@@ -1590,7 +1591,7 @@
             } finally {
                 endOperation();
             }
-        }
+        //}
     }
 
     public void removeLogicalDependencies(final Activation activation,