Glimpse - Debug

Glimpse is a thriving and growing family of open source NuGet packages that provides detailed performance, debugging and diagnostic information for ASP.NET apps. It's trivial to install, lightweight, ultra-fast, and displays key performance metrics at the bottom of every page. It allows you to drill down into your app when you need to find out what's going on at the server. Glimpse provides so much valuable information we recommend you use it throughout your development cycle, including your Azure test environment. While Fiddler and the F-12 development tools provide a client side view, Glimpse provides a detailed view from the server. This tutorial will focus on using the Glimpse ASP.NET MVC and EF packages, but many other packages are available. Where possible I will link to the appropriate Glimpse docs which I help maintain. Glimpse is an open source project, you too can contribute to the source code and the docs.

http://www.asp.net/mvc/overview/performance/profile-and-debug-your-aspnet-mvc-app-with-glimpse