Sorry Krishna, I don't know the answer. In case you can't find it either what I'd suggest is trying to cache your dashboard data at the dbms level (cache the queries results) so that the dashboard refreshes much faster when the user clicks from the report.
You don't mention what your dbms is. If it was BW you can implement the following, provided query caching is enabled on BW: 1) identify the most used or the slower queries of your dashboard. 2) Create a dummy report whose only purpose is running the target queries. 3) Schedule the dummy report daily so the results are cached on BW. 4) Dashboard will benefit from cached data.
This approach might be useful provided there are not too many combinations of dashboard executions