erp5_mrp: total quantity&price takes too much time

total quantity and price calculate all lines, in a manufacturing order with 680 lines,
it takes ~50 seconds to open it

bt5/erp5_mrp/SkinTemplateItem/portal_skins/erp5_mrp/Base_viewMRPFieldLibrary/my_total_price.xml

@@ -10,8 +10,9 @@
             <key> <string>delegated_list</string> </key>
             <value>
               <list>
-                <string>title</string>
                 <string>editable</string>
+                <string>enabled</string>
+                <string>title</string>
               </list>
             </value>
         </item>
@@ -76,6 +77,10 @@
                     <key> <string>editable</string> </key>
                     <value> <int>0</int> </value>
                 </item>
+                <item>
+                    <key> <string>enabled</string> </key>
+                    <value> <int>0</int> </value>
+                </item>
                 <item>
                     <key> <string>field_id</string> </key>
                     <value> <string>my_money_quantity</string> </value>

bt5/erp5_mrp/SkinTemplateItem/portal_skins/erp5_mrp/Base_viewMRPFieldLibrary/my_total_quantity.xml

@@ -10,8 +10,9 @@
             <key> <string>delegated_list</string> </key>
             <value>
               <list>
-                <string>title</string>
                 <string>editable</string>
+                <string>enabled</string>
+                <string>title</string>
               </list>
             </value>
         </item>
@@ -76,6 +77,10 @@
                     <key> <string>editable</string> </key>
                     <value> <int>0</int> </value>
                 </item>
+                <item>
+                    <key> <string>enabled</string> </key>
+                    <value> <int>0</int> </value>
+                </item>
                 <item>
                     <key> <string>field_id</string> </key>
                     <value> <string>my_quantity</string> </value>