This is a huge achievement for the future of the web. While the basics of what we're doing now are very simple, the ability to have code be compiled on the fly is exactly is needed to get JavaScript near pre-compiled code boundaries. I do yearn for a world where our biggest successes are much bigger than forums that graduated into social sites.

As gruseom stated, interacting with the DOM and rendering as still significantly slower than iterating through an array. I believe tracing very well could be the key to unlocking advances in that area s well.