Hi Somnath,
Thank you for the reported issue.
The reason for the observed difference in the performance of the control in the different browsers is the different JS engines they use. Internally in our implementation, we use the vanilla Array.indexOf() JavaScript function to iterate over the RadListBox items. When having around 6000 items and calling the above function for each of them, t
he Chrome V8 JS engine performs the script ca. 10 times faster that the IE 11 Chakra. At the moment this is a browser limitation for the RadListBox control.
Regards,
Veselin Tsvetanov
Telerik
Do you need help with upgrading your ASP.NET AJAX, WPF or WinForms projects? Check the
Telerik API Analyzer and share your thoughts.