http://gfycat.com/SpryMixedGelding HTML5 video: auto-selects best format for browser, reverts to GIF where required.
http://giant.gfycat.com/SpryMixedGelding.gif Slower. For "gif only" areas (eg /r/gifs, /r/reactiongifs)
<iframe src="http://gfycat.com/iframe/SpryMixedGelding" frameborder="0" scrolling="no" width="478" height="358" ></iframe>
<img class="gfyitem" data-id="SpryMixedGelding" />