New run time issue while exporting dashboard

Hi All,

        I am seeing a drastic changes in the performance in dashboard runt time.

I am just Importing the existing dashboard, and exporting it with out any changes. But the Runtime changing from 15 Sec to 2 Minutes.

Using Business Objects Dashboard Designer 4.1 SP7

I am not making any changes but there is huge performance issue, i tried with few dashboards, all the dashboards giving longer run times after re exporting to the server.

Any experienced the same issue?