Figure handle is very slow, saving impossible

[christoph]

Hello,
I'm a very beginner in octave. I want to handle big geotif images and do 
multi spectral analysis of the channels. Everything seems to work very 
fine but when it comes to visualizing with surfaceplot function the 
Figure Window reacts very slow and with poor performance.
is there a possibility to improve this behavior?
And saving the image is not possible it will result in a black image.
Images with a size of 6700 X 7100 will not be displayed at all. Just 
smaller Imagesizes will be shown at acceptable velocity (1000X1000). 
What are the reasons for that? Is there a possibility to back a more 
powerfull imageviewer?
I'm using Debian 8 with compiled libraries of
Graphicsmagick(depth32),
osmesa32,
atlas,
suitesparse,
arpack,
qrupdate.
to compile atlas 64 bit in debian I to needed to do adjustments in the 
make.inc file. Building with b 64 (as described in the, very good 
documentation) was not enough for me. I will do a new post on that if 
someone is interested.
Back to the topic, has anyone experience in visualizing large images in 
octave?
greets christoph