What's New in Report Processing and Rendering
For SQL Server 2008 R2, there have been no changes to the content that is listed in this topic.
SQL Server 2008 Reporting Services introduces fundamental changes to the report processing engine.
This release introduces enhanced rendering extensions that support on-demand report processing and more consistent paging among different renderers. When you set a page break in your report, the redesigned rendering rules for pagination provide more consistent paging behavior when you view or export your report. For more information, see Understanding Pagination in Reporting Services (Report Builder 3.0 and SSRS).
On-demand processing is a processing enhancement that renders each page of a report as you view it. This enhancement improves the way report processing handles large amounts of report data at run time.