update description

app.py

@@ -45,7 +45,9 @@ iface = gr.Interface(
     ],
     allow_flagging="auto",
     title="MolScribe",
-    description="Convert a molecular image into SMILES and Molfile. (To view the prediction better, copy-paste the Molfile to ChemDraw.) <br> " \
+    description="Convert a molecular image into SMILES and Molfile. (It typically takes 2-3 seconds to predict an image, "
+                "but may take longer if the server is busy. "
+                "To view the prediction better, copy-paste the Molfile to ChemDraw.) <br> " \
         "Paper: [_MolScribe: Robust Molecular Structure Recognition with Image-To-Graph Generation_](https://arxiv.org/abs/2205.14311) <br>" \
         "Code: https://github.com/thomas0809/MolScribe <br>" \
         "Authors: [Yujie Qian](mailto:[email protected]), Jiang Guo, Zhengkai Tu, Zhening Li, Connor W. Coley, Regina Barzilay. _MIT CSAIL_.",