Slow Response for the reports using Webdynpro based UI in EM

Hi Experts

My client has been using EM 7.0 but facing some performance issues with Webdynpro based UI. The reports are fetching results after querying the database for almost an hour where as the same report executed in Web Classic UI is fetching the records in less than 10 seconds. Do anybody has faced same kind of issue and if so could you please give me the recommendation son how to proceed with this issue?

Thanks

Ravi