title: what is "Loading symbols" and why does it take so long the first time?
body: <p>When I first execute my C# Web Application project from Visual Studio 2012, the first launch always takes quite a while, usually 20 to 30 seconds. Most of this time seems to be "Loading symbols for reference X.Y.Z.dll". Each of my around 30 references takes about a second to load these symbols. Once they've been loaded the first time, it usually only takes a few seconds for subsequent executions.</p>
  
  <p>What is this "loading symbols", exactly? Why does it take so long? Is there a way to speed it up?</p>