Problem with the visualitation of a surface

[sv]

Hi all,
from Matlab Central I've downloaded 
http://www.mathworks.com/matlabcentral/fileexchange/14915-split-step-fourier-method/content/split_step_fourier_method.m
If I run it with matlab there are no problem with the visualization of a
surface and with the rotate3D button activated the rotation is responsive.
If I use octave to run the same m-file then the time it needs to make the 
visualization of the same surface ( figure 2) is very long ( about 110 sec
)and the rotate3D is 
almost impossibile to obtain and for the latter htop shows that 
gnuplot is at 100% of cpu usage for a long time ( about 90 sec )before I can
see a
rotation.
Why this so different behaviour?

Thanks
Saverio



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