title: matplotlib taking time when being imported
body: <p>I just upgraded to the latest stable release of <code>matplotlib</code> (1.5.1) and everytime I import matplotlib I get this message:</p>
  
  <pre><code>/usr/local/lib/python2.7/dist-packages/matplotlib/font_manager.py:273: UserWarning: Matplotlib is building the font cache using fc-list. This may take a moment.
    warnings.warn('Matplotlib is building the font cache using fc-list. This may take a moment.')
  </code></pre>
  
  <p>... which always stalls for a few seconds.</p>
  
  <p>Is this the expected behaviour? Was it the same also before, but just without the printed message?</p>