[Paraview] How is builtin different from localhost?

[Biao She]

Hi all.
I have tested paraview on a builtin server and a localhost server(run
pvserver and connect client to it on the same computer). It seems to me that
the builtin server is much faster than localhost server. Since the computer
is the same, i am wondering if the localhost server have to readback all the
data in GPU and transfer these data to client in order to be displayed? On
the other hand, for the builtin server, the data in GPU is displayed
directly(no readback). Could you please explain why the localhost is slower
than builtin?
Thanks very much!

Aaron
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