Solution : https://service.sap.com/sap/support/notes/420599 (SAP Service marketplace login required)
Key words : 
multiple planning versionsbasis 46c sp46663788 bc-srv-tim-ts time stream, dp versions deletes snp anchor579503 snp-bf  planning file entry, macros549617 snp-sft cycling und safety stock521639 amo     generation, background519014 md-vm   handling planning version management495166 amo     tips, prerequisites composite sap note solution general performance-relevant notes, large stock transfer horizon760038 snp-bf  snp data extraction, snp optimizer batch runs753898 fcs     /sapapo/rtscopy job, deleting transport orders708529 snp-bf  snp initialization creates, reading information cube datasupport package 12399048 planning area maintenance, drill_up functions429422 tec     sap apo system requirements
Related Notes : 
       
| 812709 | Composite SAP note: Performance of SNP in SCM 4.1 | 
| 753137 | Composite SAP note: Performance in SNP for SCM 4.0 |