I have 7 report viewer webparts on one SharePoint page. It takes ages to load all of them, if I open the RDL directly, the report loads within 2 seconds. If I remove 6 web parts (thus, only 1 web part left) from the page, the web part loads very fast too.
How can I increase the loading time? All those updatepanels that are created in ReportViewer webpart (I checked using reflector) for lazy loading / AJAX calls / etc cause part of the trouble, I assume. Disabling viewstate is not an option, this is breaking the web parts.