Analysis for office performace is slow than BEx analyzer

HI,

We have new reports in AO, which we had in BEx previously. We have developed all the BEx into AO again with reference to BEx workbooks.

basically our BEx workbooks are built on 3x version queries, before we developed AO workbook we migrated those queries and developed new reports.  But when user runs the report in AO it is taking more time than in BEx.

Example: in Bex it takes 15 sec to get the data, but in AO it is taking 1 min to get the same data from same 7x query.

Any suggestions or setting to implement.

Thanks

John