title: Building in release mode in Visual Studio is extremely slow to startup
body: <p>I have a small solution with about 20 C# projects.  A debug build takes about 10 seconds.  However, a release build takes 1 minute 10 seconds.  During the first minute of the release build Visual Studio is unresponsive and appears to do nothing.  There is no CPU activity, only a small amount of disk activity, and no compiler output appears.  I might suspect a project custom pre-build step, but it doesn't even get to that point.  Once it starts to compile projects and I see build output, everything proceeds at normal speed - just as with debug.</p>
  
  <p>Has anyone else encountered this?   </p>