Not process in parallel and limit queue length

app.py

@@ -305,6 +305,5 @@ with iface:
             )
 # <p>This demo is strictly for research demo purpose only. For commercial use please <a href="haoheliu@gmail.com">contact us</a>.</p>
 
-iface.queue(concurrency_count=2)
-iface.launch(debug=True)
+iface.queue(max_size=10).launch(debug=True)
 # iface.launch(debug=True, share=True)