On Dec 9, 2013, at 8:45 AM, David Duncan <david.dun...@apple.com> wrote:

> One major impediment to this is that you cannot use the same graphics context 
> between multiple threads, and as such using the graphics context that AppKit 
> gives you forces you into a single threaded model.

Ah, interesting.

What’s the slow part of the drawing, Graham? Is it the CG calls themselves, or 
your own computations that lead up to them? If the latter, you could farm out 
those computations to multiple threads, and schedule the actual rendering calls 
on the single thread that has the graphics context.

—Jens
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