diff --git a/stock_picking_volume/__init__.py b/stock_picking_volume/__init__.py
index f69c7729c..6d58305f5 100644
--- a/stock_picking_volume/__init__.py
+++ b/stock_picking_volume/__init__.py
@@ -1,2 +1,2 @@
 from . import models
-from .hooks import post_init_hook, pre_init_hook
+from .hooks import pre_init_hook
diff --git a/stock_picking_volume/__manifest__.py b/stock_picking_volume/__manifest__.py
index 493c2a6a0..1de5ffe3c 100644
--- a/stock_picking_volume/__manifest__.py
+++ b/stock_picking_volume/__manifest__.py
@@ -20,7 +20,6 @@
         "views/stock_move.xml",
     ],
     "demo": [],
-    "post_init_hook": "post_init_hook",
     "pre_init_hook": "pre_init_hook",
     "development_status": "Beta",
 }
diff --git a/stock_picking_volume/hooks.py b/stock_picking_volume/hooks.py
index 6ed58d7cd..2fb34ef29 100644
--- a/stock_picking_volume/hooks.py
+++ b/stock_picking_volume/hooks.py
@@ -3,30 +3,65 @@
 
 import logging
 
-from odoo import SUPERUSER_ID, api
 from odoo.tools.sql import column_exists, create_column
 
 _logger = logging.getLogger(__name__)
 
 
-def post_init_hook(cr, registry):
-    """Post init hook to set compute the volume on pending move and pickings."""
-    env = api.Environment(cr, SUPERUSER_ID, {})
-    pickings = env["stock.picking"].search([("state", "not in", ["done", "cancel"])])
-    moves = env["stock.move"].search(
-        [
-            "|",
-            ("state", "not in", ["done", "cancel"]),
-            ("picking_id", "in", pickings.ids),
-        ]
-    )
-    _logger.info("Compute volumes for %d moves", len(moves))
-    moves._compute_volume()
-
-
 def pre_init_hook(cr):
     """Pre init create volume column on stock.picking and stock.move"""
     if not column_exists(cr, "stock_move", "volume"):
         create_column(cr, "stock_move", "volume", "numeric")
+        # First we compute the reserved qty by move_id
+        # the reserved qty is the sum of the reserved qty of the move lines
+        # linked to the move
+        # Then we update the volume of the moves not in state done or cancel
+        # If the move is in state partially available, or assigned, the volume
+        # is the reserved qty * the product volume
+        # else the volume is the move quantity * the product volume
+        cr.execute(
+            """
+            with reserved_qty_by_move as (
+                select
+                    move_id,
+                    product_id,
+                    sum(product_qty) as product_qty
+                from stock_move_line
+                group by move_id, product_id
+            )
+            update stock_move
+                set volume =
+                    CASE
+                        WHEN state in ('partially_available', 'assigned') THEN
+                            product_qty * pp.volume
+                        ELSE
+                            product_uom_qty * pp.volume
+                    END
+            from reserved_qty_by_move
+            join product_product pp on pp.id = product_id
+            where
+                stock_move.id = reserved_qty_by_move.move_id
+                and state not in ('done', 'cancel')
+            """
+        )
+        _logger.info(f"{cr.rowcount} rows updated in stock_move")
+
     if not column_exists(cr, "stock_picking", "volume"):
         create_column(cr, "stock_picking", "volume", "numeric")
+        # we recompute the volume of the pickings not in state done or cancel
+        # the volume is the sum of the volume of the moves linked to the picking
+        # that are not in state done or cancel
+        cr.execute(
+            """
+            update stock_picking
+                set volume = (
+                    select sum(volume)
+                    from stock_move
+                    where
+                        stock_move.picking_id = stock_picking.id
+                        and state not in ('done', 'cancel')
+                )
+            where state not in ('done', 'cancel')
+            """
+        )
+        _logger.info(f"{cr.rowcount} rows updated in stock_picking")