title: Slow face detection on OpenCV?
body: <p>I compiled and installed <strong>OpenCV</strong> (last version from the SVN) on <strong>Mac Os X</strong> (this is maybe the source of the problem).</p>
  
  <p>The sample works, but the <strong>face detection</strong> algorithm seems slow to me. The detection time for a face is around <strong>400ms</strong> (I just used the example included). The FPS is then quite low.</p>
  
  <p>On youtube and all, I see super-smooth video with <strong>real time</strong> face detection (even on the iPhone) so I feel confuse. I remember it being even faster on my old Windows PC.</p>
  
  <p><strong>Is 400 ms a correct detection time ?</strong></p>
  
  <p>Note : my Macbook is not old (2009) and everything runs fine on it. I use the iSight webcam (integrated webcam). I have just one face (my face) on the webcam. And it is around the same time if there is no face.</p>