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On Windows platforms, Octave uses software rendering for the OpenGL graphics
toolkits ("qt" and "fltk") by default. This is done to avoid
rendering and printing issues due to imperfect OpenGL driver implementations
for diverse graphic cards from different vendors. As a down-side, software
rendering might be considerably slower than hardware accelerated rendering.
To permanently switch back to hardware accelerated rendering with your graphic
card drivers, rename the following file while Octave is closed:
octave-home\bin\opengl32.dll
where octave-home is the directory in which Octave is installed (the
default is C:\Octave\Octave-version).