Update caching.md

content/library/advanced-features/caching.md

@@ -92,6 +92,50 @@ st.button("Rerun")
 
 Run the app again. You'll notice that the slow download only happens on the first run. Every subsequent rerun should be almost instant! 💨
 
+Here is another example that does not require downloading data from the Internet. Run this app and wait for the loading process to complete,  then refresh the web page to experience the benefits of caching! 🥳
+```python
+import streamlit as st
+import numpy as np
+import pandas as pd
+from time import time, sleep
+
+st.title('st.cache')
+
+# Using cache
+a0 = time()
+st.subheader('Using st.cache')
+
+@st.cache_data()
+def load_data_a(flag=1):
+    df = pd.DataFrame(
+    np.random.rand(2000000, 5),
+    columns=['a', 'b', 'c', 'd', 'e']
+    )
+    sleep(5)
+    return df
+
+st.write(load_data_a())
+a1 = time()
+st.info(a1-a0)
+
+
+# Not using cache
+b0 = time()
+st.subheader('Not using st.cache')
+
+def load_data_b(flag=1):
+    df = pd.DataFrame(
+    np.random.rand(2000000, 5),
+    columns=['a', 'b', 'c', 'd', 'e']
+    )
+    sleep(5)
+    return df
+
+st.write(load_data_b())
+b1 = time()
+st.info(b1-b0)
+```
+
 #### Behavior
 
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