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A Script Causes IE to Run Slowly

The problem

You receive an error message like "Stop running the script" or "A script is causing IE to run slowly" when you expand a node which loads its child nodes on demand. A timeout error could occur as well.

The resolution

You can use one of the solutions below:

  • Disable debugging in your web.config file. Note that this is the recommended setting for a production environment.
<compilation debug="false">

Or, use the second approach described below.

  • Set the ScriptMode property of ScriptManager / RadScriiptManager to "Release":
<asp:ScriptManager ID="ScriptManager1"     
                   runat="server"     
                   ScriptMode="release">
</asp:ScriptManager>
<telerik:RadScriptManager ID="RadScriptManager1"     
                          ScriptMode="Release"    
                          runat="server">
</telerik:RadScriptManager>