I'm using ODOO just for manage the deliveries (picking out) and I do not need procurement, 

In fact, I import sale orders from files which are very enormous (100 per hour, each has 50 sale order line in  average) then call the workflow order_confirm , this import is very long and consume a lot of the server ressources, so regarding to optimize, I debuggued the workflow process, and I discovered how it works (create sale order--> create procurement --> run procurement which create the stock moves and the the picking out), 

Have any one of you had a such experience, or maybe be have any hint to optimize the import ? 

PS: now, the creation of one sale order and delivery order is about 100 sale order lines per minutes (as mentioned above, we have 5000 sale order lines in average per hour)