title: Why is Document.html() so slow?
body: <p>I was under the impression that the most costly method in Jsoup's API is <a href="http://jsoup.org/cookbook/input/load-document-from-file" rel="nofollow">parse()</a>.</p>
  
  <p>But I just discovered that <a href="http://jsoup.org/apidocs/org/jsoup/nodes/Element.html#html%28%29" rel="nofollow">Document.html()</a> could be even slower.</p>
  
  <p>Given that the <code>Document</code> is the output of <code>parse()</code> (i.e. this is <em>after</em> parsing), I find this surprising.</p>
  
  <p>Why is <code>Document.html()</code> so slow?</p>