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Low rendering performance due to gl_ReadPixels #72

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I have been using visvis for a while now, but I get the impression I must be 
doing something wrong.

Rendering performance has always been low; but it is starting to become an 
issue. A simple mesh plot from any of the examples for instance, will update 
with at most a few (<10) fps. I am running on a 2012 retina mbp. My graphics 
card is working fine for any other application. What gives? I have the same 
behavior on my work computer (win7, gtx680, hardware otherwise not the issue 
either), and my old mbp.

I don't get any errors initializing ogl on startup or anything. But even if it 
was software rendering, id be disappointed. There are fewer triangles onscreen 
than in duke3d; and that's running buttery smooth on my android phone. Looking 
at the visvis code, I don't see anything suspicious. 

Is it just me? There seems to be a fillrate-dependency; if I shrink the window, 
framerates become tolerable. But seriously...

Original issue reported on code.google.com by hoogendo...@gmail.com on 16 Apr 2013 at 1:42

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