ASP.NET 5 is no longer based on System.Web.dll, but is instead based on a set of granular and well factored NuGet packages allowing you to optimize your app to have just what you need. You can reduce the surface area of your application to improve security, reduce your servicing burden and also to improve performance in a true pay-for-what-you-use model.
原文：http://www.cnblogs.com/recordlife/p/4699801.html