I've read several forums related to the slow rendering of the new Report Viewer.
I just upgraded to VS2010 from VS2008 and ReportViewer 9.0.0.0 to 10.0.0.0
Most seem to be related to dynamic grouping.
I have put together a simple test with no datasource and no data set.
I put two textboxes in a report that i use as a disclaimer, this is used as a subreport for another.
I tested by opening just this report in ReportViewer ver. 10.0.0.0 and then in 9.0.0.0.
9.0 maybe 2 seconds.
10.0 up to 15 seconds.
This is a Winforms app and ReportViewer viewing a ServerReport using simple credentials.
Any help is appreciated.