Performance on Analysis for Microsoft Office

Hi,

I'm working on Analysis for Microsoft Office, Version 1.4.0.2528.

I'm getting data from a DSO in BW. When reading that and inserting the results into the Analysis, it takes a couple of long minutes, while running the same query in BW, with transaction RSRT, it is giving me the results immediately.

Any tips on what to look at to improve the Analysis performance?

Thanks,

Miriam