FeatureLayer make the map not smooth when panning or zooming

Question

HI all ,I create a point FeatureLayer which contains perhaps 450 Features,after that ,I load a basemap and this FeatureLayer in my browser. when i zoom or pan the map,the map can not move  smoothly,the user experience is very bad.
the samples http://help.arcgis.com/en/webapi/javascript/arcgis/jssamples/#sample/widget_gauge ,its FeatureLayer contains 406 Features,however it can be operated without any delay and very smoothly.

Please HELP!
Thanks,
zoro

JohnGravois · Answer

setting "displayGraphicsOnPan" to false in the map constructor options can also improve drawing performance in older versions of Internet Explorer.

__9 · Answer

450 is perhaps very small number for the map to handle and mess up the display. Can you add some code to see what might be going wrong?

hi  svakil,the problem was solved,my IE 'version was 7,updating to the IE9 ,all are ok
thanks all the same

__9 · Answer

450 is perhaps very small number for the map to handle and mess up the display. Can you add some code to see what might be going wrong?

hello svakil,I am learnnin arcgis for javascript api during this time in the ArcGIS resource center,and making some demo related with my job.A few days ago i did a demo about featureLayer ,the code was very simple :
  
//basemap
 var tiledMapServiceLayer = new esri.layers.ArcGISTiledMapServiceLayer("http://172.18.37.177:8080/ArcGIS/rest/services/xyz/MapServer");

//FeatureLayer 450 fea
var featureLayer = new esri.layers.FeatureLayer('http://172.18.37.177:8080/ArcGIS/rest/services/xyz/MapServer/0', {
        mode: esri.layers.FeatureLayer.MODE_ONDEMAND,
        "outFields": ["DXBH"]
      });

//load map
    map.addLayer(tiledMapServiceLayer); 
    map.addLayer(featureLayer);

thanks~~