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Operation response slowly

Mar 14, 2012 at 8:29 AM

Hi all 

After loading the file .dspx which includes some shp layer, I add one drawinglayer to the mapcontrol, and make it add some features then remove them among  certain interval in the timer event, Now I try to pan the map or zoomin or zoomout , it response very slowly. I don't know why, if just loaded the file .dspx, the operation of pan or zoomin or zoomout is working very smoothly!

can somebody tell me the reason?

Thanks very much!