Glimpse shows execution timings, server configuration, request data and more, all in browser, with no changes to your application code.
Just install the NuGet package, and you're good to go!
Glimpse currently supports ASP.NET MVC, ASP.NET Webforms. Additional extensions show data for Entity Framework, nHibernate, MiniProfiler and more.
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Glimpse has a bunch of server-side collectors which feed data to a collapsible panel at the bottom of your web page. With configurable security policies, you can safely use it to debug applications in production as well as development.