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[Yann Papouin <yann.papouin@xxxxxxxxx>]

Thank you Sébastien, your explanation helped me to wrote a fix for my
issue, I reported it as Bug #915541

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https://bugs.launchpad.net/bugs/899470

Title:
  [6.0 TRUNK][STOCK] opening menu location take 45 seconds...

Status in OpenERP Addons (modules):
  New

Bug description:
  Hi all
  Everything is in the title ;)
  When I open the menu "location" from "warehouse=>configuration=>warehouse management=>location"
  OpenERP need 45 second (on a core i5) to open it, python process run at 100% :(

  The problem is really easy to understand. Let's explain.
  Scenario a database with:
  - 4000 product
  - two language installed and all product fields translated

  Two bug :
  First bug : useless stock level computation is done when we open the menu location 
  Second bug : useless read on all translated field on the object 'product.product' when we compute the stock level

  First bug:
  The view "view_location_tree2" in the file "stock/stock_view.xml" add the field "stock_real" and "stock_virtual"

          <record id="view_location_tree2" model="ir.ui.view">
              <field name="name">stock.location.tree</field>
              <field name="model">stock.location</field>
              <field name="type">tree</field>
              <field name="priority" eval="2"/>
              <field name="arch" type="xml">
                  <tree string="Stock Location" colors="blue:usage=='view';darkred:usage=='internal'">
                      <field name="complete_name"/>
                      <field name="usage"/>
                      <field name="stock_real" invisible="'product_id' not in context"/>
                      <field name="stock_virtual" invisible="'product_id' not in context"/>
                  </tree>
              </field>
          </record>

  In this case we don't need it and so we make it invisible. But making the field  invisible will not remove it from the view and we still need to compute them.
  In this case computing the stock level of the location is useless and long (45s for 4000 product)

  Second bug:
  Using browse method on the object "product.product" in the function 'get_product_available' (file : stock/product.py) should be not use. Why?
  Because we prefetch all fields with browse method. And when your database have 4000 products translated, the translation of the sale description of all of your product will be read in order to compute the stock level (yes you read it)

  For this second bug, I just apply an ugly path to test and fix it

  +        uom_ids=[]
           product2uom = {}
  -        for product in self.browse(cr, uid, ids, context=context):
  -            product2uom[product.id] = product.uom_id.id
  -            uoms_o[product.uom_id.id] = product.uom_id
  +        for product in self.read(cr, uid, ids, ['uom_id'], context=context):
  +            product2uom[product['id']] = product['uom_id'][0]
  +            if not product['uom_id'][0] in uom_ids : uom_ids.append(product['uom_id'][0])
  +        print 'uom_ids', uom_ids

  +        for uom in self.pool.get('product.uom').browse(cr, uid, uom_ids, context=context):
  +            uoms_o[uom.id] = uom
  +

  Just replacing the browse method by a read method and then I was able to open my menu in less than 2 seconds.
  It's mean that computing stock level can be done 22x faster when you have translated contain!! (great news, no?)

  Exactly the problem is not the browse method because it's cleaner to
  use browse in the code ;). The huge problem is that browse method do
  not support field restriction, I mean we can not just apply a browse
  on specific field as we can do with the read method.

  To finish If I remove the two field stock_real and stock_virtual from
  the tree view opening the menu is instantaneous.

  Hope my explication is clear. We should really fix this issue.
  Reading the translation of the sale description for computing the stock is not clean at all ;).

  Have a nice day everyone

  Also I send an email to support team with LP link, my customer have an
  OPW

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