Keydown pauses after first keyress, and subsequent keypresses
<p>Go <a href="http://jsfiddle.net/M7TKc/" rel="nofollow">Here</a></p>

<p>Use UP and DOWN keys</p>

<p>When I press a key, the red box moves down, pauses, then moves the rest.</p>

<p>How do I remove the pause?</p>
