Solution : https://service.sap.com/sap/support/notes/571113 (SAP Service marketplace login required)
Key words : 
{ipc installation directory}\lib\properties, ipc patch prevents unrequired calls, terms crm order reason, add import parameter iv_only_item_subset, response times increase, cross-item evaluation, cross-item valuation, system response occurs, /> </fields></table><table, earlier support package
Related Notes : 
       
| 571670 | |
| 571591 | Group processing of pricing only when saving | 
| 530835 | IPC Support Packages for CRM 3.0, CRM 3.1 and CRM 4.0 | 
| 486061 | How to get patches for CRM Internet Pricing Configurator |