Update app.py

app.py

@@ -192,4 +192,12 @@ with gr.Blocks(title="SDXL Space (runs Diffusers directly)") as demo:
     )
 
 # Tune queue for Spaces (concurrency + backlog)
-demo.queue(max_size=32, concurrency_count=2).launch()
+btn.click(
+    txt2img,
+    inputs=[prompt, negative, width, height, steps, guidance, images, seed, scheduler, lora_names, lora_scale, fuse],
+    outputs=[gallery],
+    api_name="txt2img",
+    concurrency_limit=1,          # keep 1 GPU job at a time
+    concurrency_id="gpu_queue"    # share queue if you add more GPU events later
+)
+demo.queue(max_size=32, default_concurrency_limit=1).launch()