Question

This is a asp.net mvc project using Razor ViewEngine (.cshtml files)

Why is the WebFormViewEngine then loaded into memory?

Answer 1

ASP.NET MVC 3 uses Razor and WebForms view engines by default. For instance imagine you ported old MVC 1 project with WebForms views to MVC 3. If you dont use WebForms then you can safely remove it in Global.asax:

public class Global : HttpApplication
{
    public void Application_Start()
    {
        ViewEngines.Engines.Clear();
        ViewEngines.Engines.Add(new RazorViewEngine());
    }
}