I have a RadComboBox that has around 400 items (from a DataBase) and I get the following JavaScript error as soon as I select "Check All":
A script on this page is causing your web browser to run slowly. If it continues to run, your computer might become unresponsive.
To optimize the CombBox I have set LoadOnDemand to true & OnClientItemsRequesting="StopRequest", but this does not seem to help.
ComboBox Properties aspx code:
<telerik:RadComboBox ID="CUD"
Width="260"
Height="150"
runat="server"
AutoPostBack="false"
CheckBoxes="true"
EnableCheckAllItemsCheckBox="true">
</telerik:RadComboBox>