Solution : https://service.sap.com/sap/support/notes/896920 (SAP Service marketplace login required)
Key words : 
sapbwnews bw support package 16 netweaver'04 stack 16, 10 content            import support package 24, 0b            import support package 30, terms query reason, noticeably affect performance, 50            import support package 16, 0            import support package 06, 0b support package 30, sapbwnews bw 7, solution bw 3
Related Notes : 
       
| 928151 | Memory consumption for MultiCubes with many part providers | 
| 872278 | SAPBINews NetWeaver 7.0 BI Support Package 06 | 
| 872275 | SAPBWNews BW Support Package 16 NW'04 Stack 16 RIN | 
| 872273 | SAPBWNews BW 3.1 Content Support Package 24 | 
| 872271 | SAPBWNews BW 3.0B Support Package 30 | 
| 829625 | SAPBINews NW7.0 BI Support Package 05 | 
| 825396 | Performance in reports with many selections |