[vtkusers] Clarify the following sentence in vtkParallelCoordinatesActor.h

[Bhanu Chander Reddy ( bhanuchanderreddy@gmail.com )]

Dear all,
I have special interest with the vtkParallelCoordinatesActor class in vtk.
The site
http://public.kitware.com/VTK/doc/nightly/html/classvtkParallelCoordinatesActor.htmlor
the
vtkParallelCoordinatesActor.h file says in the warning that the efficiency
is really bad.
The early implementation lacks many features that could be added in the
future. This includes the ability to "brush" data (choose regions along an
axis and highlight any points/lines passing through the region); efficiency
is really bad; more control over the properties of the plot (separate
properties for each axes,title,etc.; and using the labels found in the field
to label each of the axes.

Can any body who knows about this clarify what is meant by efficiency is
really bad.

-- 
Regards,
Bhanu Chander Reddy Vanteru.
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