Generally, the more visual elements are to be displayed, the slower the loading will be. This explains why loading in a larger window will take more time. In order to improve the performance of RadGridView, I can suggest you going through our online documentation on possible reasons why there would be degraded performance with it.
When using RadDataPager
, then if the PageSize is 50, then 50 items should be downloaded. I am not sure on your exact implementation though. In order to avoid any misunderstanding
, would it be possible for you to isolate the the issue in a demo project and send it to us? You can open a support ticket and attach the solution there.
That way we can check it locally and we will be able to advise further. You can take a look at this blog post for a reference on how to isolate an issue.
Check out Telerik Analytics, the service which allows developers to discover app usage patterns, analyze user data, log exceptions, solve problems and profile application performance at run time. Watch the videos
and start improving your app based on facts, not hunches.