title: File display in WebBrowser very slow with (some) networked files
body: <p>I have a Windows Form containing a WebBrowser, that I'm using to display PDF documents inside my apps. I have a Document class with a FileName property, and the WebBrowser's source is bound to that property.</p>
  
  <p>However, with some networked files, the form can take about 30 seconds (up to 2 minutes sometimes) to display a single PDF file. The network share is hosted on an IBM iSeries.</p>
  
  <p>The issue only happens in Windows 7 (on XP, the file opens instantly), and only once :</p>
  
  <ul>
  <li>User boots the workstation</li>
  <li>Launches the program</li>
  <li>Tries to view a UNC file : long delay</li>
  <li>Closes the window</li>
  <li>Tries to view the same file or any other UNC file : opens instantly</li>
  </ul>
  
  <p>Any clues as to what may be causing this ?</p>