Optimization steps for Uncompressed cube

I am new to Oracle OLAP, I have designed a cube with 4 dimensions and three measures. Since I have measures like count of staff and hours encoding, I have to group (sum) # of staff and hours encoded for each team and roll up with its tree. At the same time, I have to show average staff memebers for a given period of time with sum of hours encoded. In order to override cube aggregation, I have to uncompress cube. This is resulting serious issues. Can you please suggest me what steps to be followed to optimize performance with same uncompressed cube.
Appreciate your support.

There are a few tricks to calculate averages in a compressed cube. The subject was discussed recently on the forum. 
https://forums.oracle.com/message/10920684#10920684
The best way, if you can handle it, is to use the MAINTAIN COUNT syntax.  But this may be a stretch if you are new to OLAP.

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