title: Is there a performance gain in removing unnecessary namespace (using) directives?
body: <p>Does it matter how many using compiler directives are in my classes? Is there a performance gain in removing those that aren't necessary? </p>
  
  <p>Although I enjoy writing streamlined code, on occasion, code segments get modified, and don't have the opportunity to go back and check to see if all of the included namespaces are really necessary. Or, I don't go back and remove those that are auto-inserted by visual studio.</p>
  
  <p>i.e.: </p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Web;
  using System.Web.Mvc;
  </code></pre>
  
  <p>Thanks!</p>