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Animation Duration
AnimationDuration defines the length of the slide animation in milliseconds. Setting AnimationDuration to a value larger than 0, will cause the drag slider and selected region to be updated using a linear animationBy default AnimationDuration value is 100 (ms). To disable slide animation set AnimationDuration to 0.
ASP.NET
<telerik:radslider id="RadSlider1" runat="server" AnimationDuration="500" />C#
RadSlider1.AnimationDuration = 500;