The data extraction being performed here is not directly hitting the Cube DB. The query layer takes a long time to process(seek;aggregate and format).
I would suggest an alternative.
Move from CUBE to DSO(WO) Let the aggregations and computations performed using HANA in the transformations.The DTP can be used to narrow and filter the data volume.
I am not sure what is you target , you can automate this with the PChain and APD and improve the overall performance.
Gopi