Hello
When we are trying report big data like 10,000 rows are more, it takes awful lot of time to load the report even in the server with big configuration. Like SSRS, it should do page level load and have setting to enable and disable for each report. It will only load few pages and later should load other pages on demand instead of loading all pages. This would be big performance improvement for big data reports. 

Vijai
Spectra Energy