title: How does Visual Studio process the App_Code folder specially?
body: <p>How does Visual Studio process the App_Code folder when a change is made or detected in it? Not IIS or ASP.NET. </p>
  
  <p>I want to gain a better understanding of why Visual Studio freezes for long periods of time whenever I save a code file inside a large App_Code folder of a website project. Alternatively, I could ask: why does Visual Studio not exhibit these same freezes when processing a file inside a class library that is equally large? </p>
  
  <p>Ideally I would like to see official documentation cited from Microsoft of the issue at hand of processing the App_Code folder in Visual Studio and what happens that differs from processing a class library for example.</p>