[vtkusers] About tree structure

[刘启伟]

Hi,everybody:
When I build a scene with tree structure,like this:
------------------------------------------------------------
-root assembly
 ----assembly
----actor
----actor
----assembly
----assembly
----actor
----actor
----actor
... ...
--------------------------------------------------------------
When the counts of actors and assemblies are high, the performance of scene is very poor,  even the simple operation, such as rotate operation. So, I wonder if there has a way to solve this problem. 
Thanks.
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