What’s the use of smartnavigation property ?

In earlier versions of ASP.NET, you enable smart navigation by using the Page.SmartNavigation property. When you set the Page.SmartNavigation property to true, the following smart navigation features are enabled:
The scroll position of a Web page is maintained after postback.
The element focus on a Web page is maintained during navigation.
The flicker effect  is minimized during navigation/postback..