Solution : https://service.sap.com/sap/support/notes/602078 (SAP Service marketplace login required)
Key words :
message processing takes, object links reason, start transaction se11, ctrl+shift+f9, choose 'technical settings', enter table smw0rel, table smw0rel, choose 'change', terms smw0rel, table attributes
Related Notes :
| 653645 | Composite SAP Note performance |