Solution : https://service.sap.com/sap/support/notes/1231017 (SAP Service marketplace login required)
Key words : 
terms srm-ebp-con, attached advance correction manually, prerequisites copying conditions data, symptom creating, contract takes, large contracts, large number, items reason, inefficient loop, solution import
Related Notes : 
       
| 1169088 | SRM 6.0 Performance Guide |