ASP.NET Web Forms WebApp Incredibly Slow

Question

I have a web app written in ASP.NET Web Forms which takes like 7 seconds to perform any anction. The browser tools says that the loading time is spent to actually send the request, while to retrieve it is fine.

Here are a couple of screenshots

How could I test what's wrong other that that? I have other applications coming from the same source code, and those works fine.

The webApp is running on a local IIS server (8.5) using a classic asp.net 4 app pool and is made in Visual Studio 2010 (althought I could test it with 2013 also)

Answer 1

I scanned the whole thing using Ants Performance profiler

but I found nothing.

Anyway I found the cause were a really simple query which should've returned back a single line.. The db wasn't properly indexed so it took forever to load

Removing that query solved the problem for me

Thank guys