diff --git a/langfuse/_client/span_processor.py b/langfuse/_client/span_processor.py
index f01b081c2..a426975a3 100644
--- a/langfuse/_client/span_processor.py
+++ b/langfuse/_client/span_processor.py
@@ -12,6 +12,7 @@
 """
 
 import base64
+import logging
 import os
 import threading
 from typing import Callable, Dict, List, Optional, cast
@@ -218,9 +219,10 @@ def on_end(self, span: ReadableSpan) -> None:
                 )
                 return
 
-            langfuse_logger.debug(
-                f"Trace: Processing span name='{span._name}' | Full details:\n{span_formatter(span)}"
-            )
+            if langfuse_logger.isEnabledFor(logging.DEBUG):
+                langfuse_logger.debug(
+                    f"Trace: Processing span name='{span._name}' | Full details:\n{span_formatter(span)}"
+                )
 
             super().on_end(span)
         finally: