Solution : https://service.sap.com/sap/support/notes/683194 (SAP Service marketplace login required)
Key words : 
bw -> reporting-relevant settings -> general reporting settings -> attributes, application server level persistent cache, symptom long runtimes occur, 0b support package 19bw 3, 1c support package 13bw 3, 5 support package 02 solution previously, modes main memory cache, make data persistent, customizing transaction 'attributes, swapping persistent cache
Related Notes : 
       
| 647749 | SAPBWNews BW 3.0B Support Package 19 | 
| 647747 | SAPBWNews BW 3.0B Support Package 18 | 
| 601038 | SAPBWNews BW 3.1 Content Support Package 12 |