diff --git a/jsprit-core/src/main/java/jsprit/core/algorithm/box/Jsprit.java b/jsprit-core/src/main/java/jsprit/core/algorithm/box/Jsprit.java
index 037e7b38..54005ecc 100644
--- a/jsprit-core/src/main/java/jsprit/core/algorithm/box/Jsprit.java
+++ b/jsprit-core/src/main/java/jsprit/core/algorithm/box/Jsprit.java
@@ -407,7 +407,7 @@ public class Jsprit {
         final DefaultScorer scorer;
 
         if (es != null) {
-            RegretInsertionConcurrent regretInsertion = (RegretInsertionConcurrent) new InsertionBuilder(vrp, fm, stateManager, constraintManager)
+            RegretInsertionConcurrentSlow regretInsertion = (RegretInsertionConcurrentSlow) new InsertionBuilder(vrp, fm, stateManager, constraintManager)
                 .setInsertionStrategy(InsertionBuilder.Strategy.REGRET)
                 .setConcurrentMode(es, noThreads)
                 .considerFixedCosts(toDouble(getProperty(Parameter.FIXED_COST_PARAM.toString())))
@@ -418,7 +418,7 @@ public class Jsprit {
             regretInsertion.setScoringFunction(scorer);
             regret = regretInsertion;
         } else {
-            RegretInsertion regretInsertion = (RegretInsertion) new InsertionBuilder(vrp, fm, stateManager, constraintManager)
+            RegretInsertionSlow regretInsertion = (RegretInsertionSlow) new InsertionBuilder(vrp, fm, stateManager, constraintManager)
                 .setInsertionStrategy(InsertionBuilder.Strategy.REGRET)
                 .setAllowVehicleSwitch(toBoolean(getProperty(Parameter.VEHICLE_SWITCH.toString())))
                 .considerFixedCosts(toDouble(getProperty(Parameter.FIXED_COST_PARAM.toString())))
diff --git a/jsprit-core/src/main/java/jsprit/core/algorithm/recreate/InsertionBuilder.java b/jsprit-core/src/main/java/jsprit/core/algorithm/recreate/InsertionBuilder.java
index b4732b74..165173e6 100644
--- a/jsprit-core/src/main/java/jsprit/core/algorithm/recreate/InsertionBuilder.java
+++ b/jsprit-core/src/main/java/jsprit/core/algorithm/recreate/InsertionBuilder.java
@@ -166,13 +166,13 @@ public class InsertionBuilder {
             }
         } else if (strategy.equals(Strategy.REGRET)) {
             if (executor == null) {
-                RegretInsertion regret = new RegretInsertion(costCalculator, vrp, fleetManager);
-                regret.setSwitchAllowed(allowVehicleSwitch);
+                RegretInsertionSlow regret = new RegretInsertionSlow(costCalculator, vrp);
+//                regret.setSwitchAllowed(allowVehicleSwitch);
                 insertion = regret;
 
             } else {
-                RegretInsertionConcurrent regret = new RegretInsertionConcurrent(costCalculator, vrp, executor, fleetManager);
-                regret.setSwitchAllowed(allowVehicleSwitch);
+                RegretInsertionConcurrentSlow regret = new RegretInsertionConcurrentSlow(costCalculator, vrp, executor);
+//                regret.setSwitchAllowed(allowVehicleSwitch);
                 insertion = regret;
             }
         } else throw new IllegalStateException("you should never get here");