diff --git a/src/pineko/cli/convolve.py b/src/pineko/cli/convolve.py
index 6244ae35..e31921d4 100644
--- a/src/pineko/cli/convolve.py
+++ b/src/pineko/cli/convolve.py
@@ -67,6 +67,7 @@ def subcommand(
     PDF is an optional PDF set compatible with the EKO to compare grid and FK table.
     """
     grid = pineappl.grid.Grid.read(grid_path)
+    grid.optimize()
     n_ekos = len(op_paths)
     with eko.EKO.edit(op_paths[0]) as operators1:
         rich.print(
diff --git a/src/pineko/evolve.py b/src/pineko/evolve.py
index 482fbd16..3fc3323c 100644
--- a/src/pineko/evolve.py
+++ b/src/pineko/evolve.py
@@ -189,7 +189,6 @@ def write_operator_card(pineappl_grid, default_card, card_path, tcard):
     """
     # Add a +1 to the orders for the difference in convention between nnpdf and pineappl
     # NB: This would not happen for nFONLL
-    pineappl_grid
     is_fns = int(check.is_fonll_mixed(tcard["FNS"], pineappl_grid.channels()))
     max_as = 1 + tcard["PTO"] + is_fns
     max_al = 1 + tcard["QED"]