Update app.py

app.py

@@ -306,4 +306,9 @@ with gr.Blocks(css=css) as demo:
 # START THE GRADIO SERVER
 # ------------------------------------------------------------------
 
+# 🔧 1) turn the global queue ON and set its default_concurrency_limit to 1  
+demo.queue(default_concurrency_limit=1,        # ≤ 1 worker per event
+           max_size=20)                        # optional: allow 20 waiting jobs
+
+# 🔧 2) launch as usual
 demo.launch(share=True)