Virtual scrolling does not work for big datasets in IE and Firefox. We need adaptive scrolling http://stackoverflow.com/questions/2402953/javascript-data-grid-for-millions-of-rows
Hi,
Generally the grid can display between one and two milions of records and its capacity is related to the browser capabilities as mentioned here. Since this is an old thread the browsers at the time might not have been that efficient. If there is an specific case I would recommend opening a support ticket and providing the implementation details there.
Regards,
Angel Petrov
Progress Telerik