Moving towards WebComponents: slides
Thursday, January 17, 2013 11:36:33 PM
You can test this now in Chrome 26, or any other browser with <x-tag> polyfill from mozilla.
Not production ready, yet, but still - ES6's Object.observe gives up to 40x speed up compared with traditional polling. (Yes, strictly speaking, Object.observe is not a part of WebComponents, but read slides, and you'll see)