Update app.py

app.py

@@ -79,6 +79,12 @@ def init_FD_seed_frame():
 
     return FD_seed
 
+@st.cache_data
+def convert_df_from_parquet(df):
+    # IMPORTANT: Cache the conversion to prevent computation on every rerun
+    working_file = df.read_parquet()
+    return working_file.to_csv().encode('utf-8')
+
 dk_raw, fd_raw = init_baselines()
 
 tab1, tab2 = st.tabs(['Data Export', 'Contest Sims'])
@@ -142,7 +148,7 @@ with tab1:
                 if 'data_export' in st.session_state:
                         st.download_button(
                             label="Export optimals set",
-                            data=st.session_state.data_export.to_csv().encode('utf-8'),
+                            data=convert_df_from_parquet(st.session_state.data_export),
                             file_name='MLB_optimals_export.csv',
                             mime='text/csv',
                         )
@@ -169,7 +175,7 @@ with tab1:
                 if 'data_export' in st.session_state:
                         st.download_button(
                             label="Export optimals set",
-                            data=st.session_state.data_export.to_csv().encode('utf-8'),
+                            data=convert_df_from_parquet(st.session_state.data_export),
                             file_name='MLB_optimals_export.csv',
                             mime='text/csv',
                         )