On 11 Mar 2015, at 23:40, Matthieu Beghin <[email protected]> 
wrote:
> Any idea ?

You're not doing anything graphics or OpenGL-related, are you? At least in the 
old days, Macs would turn off the GPU when no screen was attached, meaning that 
you'd end up in software emulation when you did any openGL calls. I thought 
that was different these days, but maybe this reminds you of something you're 
doing that could cause this slowdown?

-- Uli/


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