Update app.py

app.py

@@ -599,4 +599,4 @@ with gr.Blocks(css=css) as demo:
         upscale_event = upscale_btn.click(fn=upscale_fn, inputs=[upscale_image_input, scale_by], outputs=[upscale_output, upscale_btn, upscale_stop])
         upscale_stop.click(fn=stop_upscale, outputs=[upscale_btn, upscale_stop], cancels=[upscale_event])
 
-demo.launch(max_threads=256)
+demo.queue().launch(max_threads=256)