Update app.py

app.py

@@ -2,7 +2,7 @@ import gradio as gr
 import time
 def update(name):
     time.sleep(25)
-    return f"Welcome to Gradio, {name}!"
+    return f"Welcome to Gradio!"
 
 def test():
     return("test")
@@ -17,5 +17,5 @@ with gr.Blocks() as demo:
     inp.upload(fn=test, outputs=out_test)
     btn.click(fn=update, inputs=inp, outputs=out)
 
-demo.queue()
+demo.queue(default_concurrency_limit=1)
 demo.launch()