title: React performance inspection with printWasted
body: <p>I'm trying to understand what <code>React.addons.perf.printWasted</code> is trying to tell me about the RouteHandler component.  I start the capture, transition to page, stop the capture and check the <code>printWasted</code> and see this as our biggest waste. </p>
  
  <p><code>0  "AppTemplate &gt; RouteHandler"    172.6510003209114   11</code></p>
  
  <p>We are using <code>ReactRouter</code> 0.13 and are still using the <code>Router.RouteHandler</code> to handle our routes and it looks like RouteHandler is taking its sweet time and not really rendering anything.  </p>
  
  <p>Is this a problem with <code>ReactRouter</code> or is this literally the Page that's being bootstrapped into the <code>RouteHandler</code>?  Meaning, is this something I should fix in my component?  Perhaps too much time doing other things before rendering the component?</p>
  
  <p>Thanks.</p>