1.
// diagram1 is a MindFusion.Diagramming.Diagram
// item is a ShapeNode
this.diagram1.Items.Add(item);

this line called 37 times, and took 14.8881 seconds (0.4024 sec / per call)

2.
// item is a TableNode
this.diagram1.Items.Add(item);

this line called 17 times, and took 8.9669 seconds (0.5275 sec / per call)


We are not satisfying with this performance, how can we improve the performance?

BTW: we are using FC.Net Pro 5.1.0, and undo is disabled.