Solution : https://service.sap.com/sap/support/notes/1627122 (SAP Service marketplace login required)
Key words : 
prepare tuple import data stage, prepare tuple import data, symptom import performance, xml source file, specific flaw addressed, - change list #98792- mdm 7, - change list #98793o, tuple definition, code change, terms - keywords
Related Notes : 
       
| 1626982 | SAP Release Note for MDM 7.1 SP07 Patch17 | 
| 1626981 | SAP Release Note for MDM 7.1 SP06 Patch35 |