遍历MapObject2.3的Recordset对象效率很低不知道什么原因

<P>代码如下：</P>
<P>dim lyr as MapLayer=Map.Layers(0)dim rs as Recordset=Map.Layers(0)</P>

<P>Assistant.SelectedRecordset = Assistant.SelectedLayer.SearchShape(shape, SearchMethodConstants.moEdgeTouchOrAreaIntersect, "SysNumber<>''")</P>