Add CPU-only speed warning to HF Space demo

app.py

@@ -72,7 +72,9 @@ demo = gr.Interface(
         "Convert a static image to an editable PowerPoint file. "
         "OCR detects text, classical CV builds a text mask, LAMA inpaints "
         "the background clean, and python-pptx reconstructs editable text boxes.\n\n"
-        "For a full browser-based editor, visit [pxGenius.ai](https://pxgenius.ai)."
+        "**Note:** This demo runs on CPU-only. Expect **4+ minutes** per image. "
+        "For faster results, run locally with GPU/Apple Silicon or use "
+        "[pxGenius.ai](https://pxgenius.ai) for a full browser-based editor."
     ),
     examples=[
         ["examples/chart_good1.png", "auto"],