Hi Team,

I am using RadListBox and attaching 6000 values to it.  When user clicks on select all option of the check box in RadListBox, it takes around 50 sec to check all the items in IE11 and in chrome it takes 4 sec. Can anyone suggest, how to improve the performance of RadListBox?

Regards,

Somnath

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, the 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