Release mesh memory too

xesmf/frontend.py

@@ -1312,13 +1312,15 @@ def _compute_weights(self, grid_in, grid_out):
 
         # Get weights for external polygons
         w, area = self._compute_weights_and_area(grid_in, mesh_ext)
+        mesh_ext.destroy()  # release mesh memory
 
         # Get weights for interiors and append them to weights from exteriors as a negative contribution.
         if len(interiors) > 0 and not self.ignore_holes:
             mesh_int = Mesh.from_polygons(interiors)
 
             # Get weights for interiors
             w_int, area_int = self._compute_weights_and_area(grid_in, mesh_int)
+            mesh_int.destroy()  # release mesh memory
 
             # Append weights from holes as negative weights
             # In sparse >= 0.16, a fill_value of -0.0 is different from 0.0 and the concat would fail