diff --git a/streamlit_app.py b/streamlit_app.py
index 5af7928..ac45d6d 100644
--- a/streamlit_app.py
+++ b/streamlit_app.py
@@ -12,6 +12,7 @@
 import streamlit as st
 import base64
 from io import BytesIO
+@st.cache
 
 def heav(x):
     if x > 0.0: