Gets or sets the maximum number of dynamic child items to show at each level. Dynamic child items are subsites (that is, any SPWeb objects) and pages.
Assembly: Microsoft.SharePoint.Publishing (in Microsoft.SharePoint.Publishing.dll)
You can use this property to limit the effect of poor navigation management. When a Web site has a large number of subsites or pages, and Show subsites or Show pages options are enabled, all items are displayed in the navigation menus. Showing a large number of items in the navigation menu is not useful and can have a negative impact on performance.