Switched to default_concurrency_limit, and set to 20

app.py

@@ -722,7 +722,6 @@ with gr.Blocks(css=css, theme=gr.themes.Soft(primary_hue="indigo", neutral_hue="
         fn=check_inputs,
         inputs=[subject, image_input, selected_index],
         outputs=None,
-        concurrency_limit=None
     ).success(
         fn=handle_generation,
         inputs=[image_input, subject, duration, selected_index],
@@ -737,5 +736,5 @@ with gr.Blocks(css=css, theme=gr.themes.Soft(primary_hue="indigo", neutral_hue="
     )
 
 if __name__ == "__main__":
-    demo.queue(default_concurrency_limit=None)
+    demo.queue(default_concurrency_limit=20)
     demo.launch()