`app.py`: set concurrency to 1

app.py

@@ -164,5 +164,5 @@ with gr.Blocks(css=css) as demo:
 
         text_button.click(flip_text, inputs=[prompt, negative_prompt, model, steps, sampler, cfg_scale, width, height, seed], outputs=image_output)
 
-demo.queue(concurrency_count=5)
+demo.queue(concurrency_count=1)
 demo.launch()