diff --git a/designer-base/src/main/java/com/fr/design/carton/developer/EventDispatchDeveloperMode.java b/designer-base/src/main/java/com/fr/design/carton/developer/EventDispatchDeveloperMode.java
index a87e900ac..5381ff7ff 100644
--- a/designer-base/src/main/java/com/fr/design/carton/developer/EventDispatchDeveloperMode.java
+++ b/designer-base/src/main/java/com/fr/design/carton/developer/EventDispatchDeveloperMode.java
@@ -34,7 +34,7 @@ public final class EventDispatchDeveloperMode extends EventQueue {
      */
     public static final long CHECK_INTERVAL_MS = 5;
 
-    private static final int CORE_THREAD_SIZE = 5;
+    private static final int CORE_THREAD_SIZE = 1;
 
     private ScheduledExecutorService timer;