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Date: Tue, 28 Jul 2015 12:07:06 +0200 (CEST)
From: Roland Lutz <rlutz AT hedmen DOT org>
To: "Gabriel Paubert (paubert AT iram DOT es) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Subject: Re: [geda-user] pcb-rnd feature poll: please vote
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On Tue, 28 Jul 2015, Gabriel Paubert (paubert AT iram DOT es) [via geda-user AT delorie DOT com] wrote:
> I don't have any pcb with non-gl gtk installed,
> but on my (old) desktop, with a maximized 1920x1200
> window, and viewing the whole board, the results are:
>
> A simple, small (40x25mm), 2 layers board with 33 components:
> pcb lesstif:  5.1 redraws per second
> pcb gtk+gl:  31.1 redraws per second
>
> A complex, large (200x80mm), 6 layers board with
> almost 700 components:
> pcb lesstif:  1.3 redraws per second
> pcb gtk+gl:   4.6 redraws per second

The point about using OpenGL is that, with modern techniques, drawing can 
be optimized enormously.  When comparing the task of rendering a PCB with 
what current games do, I believe that a render time of <10ms should be 
possible even with the most complex board.  The fact that PCB uses OpenGL 
doesn't mean that PCB actually employs these optimizations, though.

Roland