[vtkusers] how to quantify executing time

[WangQ]

Hello vtkusers,
I wonder if there is any way to measure the executing time from very beginning till rendering finish in VTK? Seems conventional tic toc inapplicable to VTK. 
It would be great if can separate computation time, e.g. time for processing data, and rendering time.
Cheers, 
Chiang 		 	   		  
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