title: How is dart2js code faster than javascript?
body: <p>I'm trying to better understand dart's effect on performance. On the <a href="https://www.dartlang.org/performance/" rel="noreferrer" title="Dart Performance">dart website</a>, their benchmarks show that Dart code compiled to Javascript is faster than just Javascript. How is this possible?</p>
  
  <p><img src="https://i.stack.imgur.com/KbRFM.png" alt="Tracer Benchmarks" title="Tracer Benchmarks"></p>
  
  <p>I understand how the Dart VM is faster than v8, but what I don't get is how dart2js-generated javascript is faster than plain old javascript, when both are running in the same environment, v8.</p>