Visual Studio 2015 comes with IIS Express, which enables the localhost to serve as a web server without having to set up the app in Windows IIS. I was building a C#/MVC/Bootstrap site that kept crashing IIS Express. Some research revealed that we can run the server in 64-bit mode: Just go to Tools > Options > Projects and Solutions > check the box for "Use the 64 bit version of IIS Express for web sites and projects."
Memory usage by IIS Express went from over 700MB to 8MB now. Much better.