Solution : https://service.sap.com/sap/support/notes/753137 (SAP Service marketplace login required)
Key words : 
519014 md-vm     handling planning version management858137 md-pr     product, snp optimizer batch runs819325 snp     performance problems planning run, large stock transfer horizon742563 fcs-bf  /sapapo/ts_parea_initialize, dp version deletes snp anchor table692528         endless loop, deleting time series850180 md-vm   version copy, macro fm //demand_calc843585 fcs     version copy, handling alert monitor485018 snp-opt   info, time series744896 snp-bf  initialization/consistency check, snp planning area806574 md-src  performance, /sapapo/tsqmlo empty786941 snp-bf  performance
Related Notes : 
       
| 812709 | Composite SAP note: Performance of SNP in SCM 4.1 | 
| 766827 | Composite SAP note: Performance SCM 4.0 | 
| 548832 | SNP Performance for 3.10 | 
| 420599 | Composite SAP Note: Performance of SNP 3.0A |