Single DB hit for Report Publication

We have some Crystal Reports and Webi Reports

Each Report we need to distribute to the end users in PDF/Excel Format. For Each reports the users >10000 members 

Currently we are generating the reports trough publications . We have implemented role based / hierachy based secuirity in one table ( with has BOUSERID Filed ) and that table we are joining with Reporting table and created BOUSERID prompt( This wiill be in Where class of the underlying report query )

This parameter is associated with profile value ( Profile Value is BOUSERID System variable )

So basically the personification with BOUSERID  Profile value and the report hits the DB for 1000 times This is time consuming

My Planing to implement the Single DB hit and  divide the report to all the users through Publication . Dynamic distribution is not good for our requirement

Please suggest me best approach and steps to achieve

Thanks in advance

Yogi