[OpenLayers-Users] The vector overlay are clipped while dragging the map

[maven apache]

Hi:

When I add some vector overlays(like polyline or polygon) in the map, and
then drag the map, I found that the overlays seems been clipped.


I am afraid I can not explain this clearly, I made a screen shot:
http://imgbin.me/image/OBSATKWP.jpg.


Is this deliberate for performance or something else?
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