If Razor is the only view engine you use in an ASP.NET MVC
application, then it makes sense to remove the Web Forms view engine and
save some cycles. Otherwise, the MVC runtime will go looking for .aspx
and .ascx files when it tries to locate a view or template. A small
savings, but just 2 lines of code required during application startup.
ViewEngines.Engines.Clear();ViewEngines.Engines.Add(new RazorViewEngine());