title: Script.aculo.us Sortable onUpdate problem in IE
body: <p>I'm working on a project where I am using a script.aculo.us Sortable object.</p>
  
  <p>It works nice and fast in Firefox and Chrome, but in IE it is incredibly slow whenever I drop an element.</p>
  
  <p>I've done a little checking, and it turns out that in IE, the "onUpdate" callback function gets called about 8 times every time I drop.   Normally it is supposed to only get called one time per sortable container (destination and origin).</p>
  
  <p>Since my callback function resizes some elements and draws graphs in those elements, the computation involved for each call is considerable.</p>
  
  <p>Does anyone know what could be causing this problem in IE, or how to fix it?</p>
  
  <p>EDIT:
  I've noticed that the problem isn't that it triggers many many times when it is dragged, the problem is that the <code>onUpdate</code> function gets fired when the order of a sortable changes, even if the drag hasn't ended.   It seems that <code>onUpdate</code> is actually working like the <code>onChange</code> callback, but only IE.</p>