I want to build a SaaS based application which will be very much light weight and faster, please suggest me. Also please tell me which mvc version is better for development mvc5 or mvc4.
For the first part, try to ask an actual question. I’m not sure which kind of suggestion you are looking after (how to make something light weight and fast ?! or you don"t know at all which kind of application you want to create ?)
For the 2nd part see http://www.asp.net/mvc/overview/releases/whats-new-in-aspnet-mvc-52 and around for differences between 4 and 5. It seems to make sense to just use the
later version (or could it be some confusion with ASP.NET 5?)