Hi Manikantan,
There are so many factors in Analysis report which may leads to perform issue.
Try to run same report by setting Manage-> Change Reporting Preferences- Set it to Data load scheme and observe time taken for displaying report.
Try to run same report by setting Manage-> Change Reporting Preferences- UnCheck the Data load scheme Option and observe time taken for displaying report.
I suspect you might be running your report whenever data load is happening in your system and who ever the users has limited permission to run reports based data load schema( at time of data load is happening) then there may be chance of slow performance.
Please note only few user will be given access to run the reports in both Data and Presentation Schema.
Hope this may help you to some extended.
Regards,
Vignesh.S