Update demo_gr.py

demo_gr.py

@@ -1255,7 +1255,7 @@ def main(server_port: int | None = None, share: bool = True):
         )
         app.unload(stop_server_and_abort_event)
 
-    app.queue(max_size=1).launch(
+    app.queue(max_size=3).launch(
         share=True,
         server_port=server_port,
         show_error=True,