limit concurrency to 1

app.py

@@ -166,4 +166,4 @@ 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(default_concurrency_limit=4, max_size=32, api_open=False).launch(max_threads=128)
+demo.queue(default_concurrency_limit=1, max_size=32, api_open=False).launch(max_threads=128)