diff --git a/popcorn.py b/popcorn.py
index e1dd707..7a65155 100644
--- a/popcorn.py
+++ b/popcorn.py
@@ -109,7 +109,7 @@ def _():
 
 @app.cell
 def _():
-    df = (
+    df_lazy = (
         pl.scan_ndjson("data/daily/*", include_file_paths="file")
         .head(LIMIT_ROWS)  # FIXME: take out after debug
         .with_columns(
@@ -121,22 +121,21 @@ def _():
         .select("date", pl.col("Packages").struct.unnest())
         .fill_null(0)
         .unpivot(index="date", variable_name="package", value_name="downloads")
-        .collect()
     )
-    df
+    df_lazy
     return
 
 
 @app.cell
-def _(df: pl.DataFrame):
+def _(df_lazy: pl.LazyFrame):
     def _():
         weekly_downloads = (
-            df.sort("date")
+            df_lazy.sort("date")
             .group_by_dynamic("date", every="1w")
             .agg(pl.col("downloads").sum())
             .sort("date")
+            .collect()
         )
-
         return (
             lp.ggplot(weekly_downloads, lp.aes("date", "downloads"))
             + lp.geom_line()
@@ -145,30 +144,33 @@ def _(df: pl.DataFrame):
                 title="Weekly downloads",
             )
         )
-
     _()
     return
 
 
 @app.cell
-def _(df: pl.DataFrame):
+def _(df_lazy: pl.LazyFrame):
     def _():
-        weekday_downloads = df.sort("date").with_columns(
-            pl.col("date")
-            .dt.weekday()
-            .sort()
-            .replace_strict(
-                {
-                    1: "Mon",
-                    2: "Tue",
-                    3: "Wed",
-                    4: "Thu",
-                    5: "Fri",
-                    6: "Sat",
-                    7: "Sun",
-                }
+        weekday_downloads = (
+            df_lazy.sort("date")
+            .with_columns(
+                pl.col("date")
+                .dt.weekday()
+                .sort()
+                .replace_strict(
+                    {
+                        1: "Mon",
+                        2: "Tue",
+                        3: "Wed",
+                        4: "Thu",
+                        5: "Fri",
+                        6: "Sat",
+                        7: "Sun",
+                    }
+                )
+                .alias("weekday")
             )
-            .alias("weekday")
+            .collect()
         )
 
         return (
@@ -179,7 +181,6 @@ def _(df: pl.DataFrame):
                 caption="Downloads aggregated per day of the week they took place.",
             )
         )
-
     _()
     return