The problem we are facing in this RadGrid Control is that rendering from Client Side is taking long time in the browsers especially in IE. The Client Side is taking more time to render in the grids than the Server Side code.
For example : We are rendering 4555 records and it takes morethan 25 seconds to load the controls.
Because, the control hasn't rendered the page completely.
IE 9 Show Grid 25 Secs - Total Page Load Time 25 Secs
IE 10 Show Grid 5 Secs - Total Page Load Time 7 Secs
FireFox(16.0.2) Show Grid 3 Secs - Total Page Load Time 8 Secs
Chrome(30.0.1599.22) Show Grid 2 Secs - Total Page Load Time 6 Secs
Sharepoint Version: 14.0.6137.5000 Telerik version: 2013.2.611.35
Attached is a document which provides the benchmarks of browsers using Fiddler tool and a Wsp that has RadGrid Control and some sample records to replicate the issue in the SharePoint environment. Please download from the below link.
WSP: https://www.dropbox.com/s/1duip123w68zo83/PerformanceTest.zip
Document: https://www.dropbox.com/s/0w5etx4l2k2y6ri/Telerik%20Grid_Performance_SharePoint%202010.docx
S Loganathan