http://gfycat.com/AnchoredCrispFantail HTML5 video: auto-selects best format for browser, reverts to GIF where required.
http://giant.gfycat.com/AnchoredCrispFantail.gif Slower. For "gif only" areas (eg /r/gifs, /r/reactiongifs)
<iframe src="http://gfycat.com/ifr/AnchoredCrispFantail" frameborder="0" scrolling="no" width="600" height="336" style="-webkit-backface-visibility: hidden;-webkit-transform: scale(1);" ></iframe>
<img class="gfyitem" data-id="AnchoredCrispFantail" />