Heavy 3D graph crashing octave

[rcharan51]

I have a problem when I surf plot a big 3d surface. It is not only slow to
interact (just to change the view), many it crashes octave(fltk toolkit,
octave 4.0.0, Win10 64 bit 8GB ram). I think  using gnuplot makes it even
worse. 

So, Can anyone help me to reduce the data points density to such a extent
that it wont affect the shape of the surface? Is data binning a alternative
for this problem?

FYI the mat file of the surface is 350MB !!

Here are the files ( X Y Z data)
https://drive.google.com/a/iitbbs.ac.in/folderview?id=0B8j-cnUfgldTNU80NVoyejFVd2c&usp=sharing
<https://drive.google.com/a/iitbbs.ac.in/folderview?id=0B8j-cnUfgldTNU80NVoyejFVd2c&usp=sharing>
   



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