title: Arcgis map graphics run hopelessly slow on IE8
body: <p>I'm working on a project via arcgis javascript api.
  With hundreds of graphics drawn on a graphicsLayer, it works well on chrome or IE11, but on IE8 and supposedly also IE6 when I drag the map, it's extremely slow so that makes it completely unusable. 
  I found the "displayOnPan" option of graphicslayer which seems to be designed specifically for IE. But if I turn that off, the performance is still unsatisfactory, besides, the disappearing and reappearing of the graphics each time the map is panned are really irritating.</p>
  
  <p>No question of requiring the users to update or change the browser.
  Is there any ways to the problem?</p>