The long waited Cumulative Update 7 for Reporting Services 2008 R2 is finally out.
The product team has worked very hard to include some performance fixes related to the new inclusion of Ajax functionality in this version.
Some of the fixes bellow:
FIX: Performance decreases after you move a report that contains a large multi-select drop-down parameter list to SQL Server 2008 R2 Reporting Services
FIX: Performance decreases after you move a large report to SQL Server 2008 R2 Reporting Services
I am really proud to recommend you to install it from http://support.microsoft.com/kb/2507770
We recommend that you test hotfixes before you deploy them in a production environment…
Reporting Services Support Engineer