diff --git a/api/ragflow_server.py b/api/ragflow_server.py
index 024492cec..f036967bc 100644
--- a/api/ragflow_server.py
+++ b/api/ragflow_server.py
@@ -28,7 +28,6 @@ import signal
 import sys
 import time
 import traceback
-from concurrent.futures import ThreadPoolExecutor
 import threading
 import uuid
 
@@ -125,8 +124,16 @@ if __name__ == '__main__':
     signal.signal(signal.SIGINT, signal_handler)
     signal.signal(signal.SIGTERM, signal_handler)
 
-    thread = ThreadPoolExecutor(max_workers=1)
-    thread.submit(update_progress)
+    def delayed_start_update_progress():
+        logging.info("Starting update_progress thread (delayed)")
+        t = threading.Thread(target=update_progress, daemon=True)
+        t.start()
+
+    if RuntimeConfig.DEBUG:
+        if os.environ.get("WERKZEUG_RUN_MAIN") == "true":
+            threading.Timer(1.0, delayed_start_update_progress).start()
+    else:
+        threading.Timer(1.0, delayed_start_update_progress).start()
 
     # start http server
     try: