Solution : https://service.sap.com/sap/support/notes/637065 (SAP Service marketplace login required)
Key words : 
crm-specific application tables crmm_but_, terms dbtablogbp_exchange_r3_to_crm reason, 'rec/client' parameter, technical settings, business partner, performance loss, table dbtablog, system profile, transaction scu3, table leads
Related Notes : 
       
| 636216 | Logging / overflow of table DBTABLOG | 
| 537486 | Composite SAP note:perfrmnce problms during initial download |