[vtkusers] Question about Callback Efficiency

[ysa0829]

hi all,

I use ImageViewer2 to display DICOM image,and I add observer
vtkCommand::OnMouseMove.

The fucntion return the slice position that mouse picked.

When I add a widget such as vtkContourWidget and vtkSeedWidget, The Callback
efficiency would be more fat than hust only MouseMoveEvent .

I do not know why I can increase  efficiency when I  add Widget .

Someone know that?

Thanks and regards, 
Anne. 

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