What tricks did Fabrice Bellard use to make his PC emulator in Javascript so fast?
<p>Fabrice Bellard's <a href="http://bellard.org/jslinux/" rel="nofollow">PC emulator implemented in Javascript</a> is impressively fast--it boots a small Linux image <em>in the browser</em> within a few seconds.</p>

<p>What techniques were used to get this performance?</p>
