max concurrency = 1

app.py

@@ -13,7 +13,7 @@ def process_and_display(image, voice):
     state = {"image": image, "voice": voice, "caption": "", "description": ""}
 
     # Run the graph
-    result = graph.invoke(state)
+    result = graph.invoke(state, max_concurrency=1)
 
     descriptions:list[str] = result["descriptions"]
     description = "\n---\n".join(descriptions)