clustering performance

[JustinSong]

Hi all,

I have about 70,000 collision points covering entire BC (Canada) and displayed the feature layer with clustering. However, it takes too long (~2 min) to cluster features.
When I display with dynamic type, it takes less than 5 seconds.

I understand it takes long time when I display entire features (70K); however, even when I zoom in and display small area (displaying less than 200 features), it also takes long time. Can anyone let me know why it takes long time even when I display small number of features in small area? Does ArcGIS cluster entire features first and then display the area that I zoomed in?


I am using Flex Viewer 2.4 and SOC machine (=web server = SOM, in one machine) has Windows Server 2008 (2GB MEM, Dual 2.7GHz CPU)

<layer label="home:cluster" type="feature" visible="false"
                   url="http://xxx.xxx.xx.xx/ArcGIS/rest/services/clusters/MapServer/0">
                   <clustering mingraphiccount="10" sizeinpixels="20">
               <clustersymbol type="simple"
                   color="0x267300"
                   textcolor="0xFFFFFF"
                   sizes="15,20,30"
                   textsize="15"
                   alpha="1"
                   weights="10,100,9999" />
             </clustering>
</layer>