Scheduled WEBI reports based on File Events not retrieving data

Dear All,

We are facing performance related issues with Scheduled WEBI reports based on file based events.

When running Web Intelligence on demand it takes  4to 5 Minutes.

Scheduling the same report in Excel format it takes more than 20 minutes.Schedule status showing success but no data found in Excel instance.

Env:BOXI3.1 Sp3

Windows 2003

It woud be great if any one can share your ideas.

Thanks,

Kumar