title: HTML5 Fullscreen API & performance
body: <p>I'm coding an app around video content and am currently playing around with HTML5's fullscreen API (I know it is still in very early stage).</p>
  
  <p>Because of what my application does, the video itself isn't the only part that goes fullscreen: several elements alongside go fullscreen too, and I have noticed a great drop in performance there. The video streams ok, but other graphical elements suddenly get painfully slow. For example, a hover style typically takes about a good half second before showing up. A simple change in subtitles (I use popcorn.js) causes the video to freeze for a fraction of a second.</p>
  
  <p><strong>Any one knows why this is so? Do you experience the same?</strong> Thanks for your precious feedback.</p>