Well the thing is that running a script from Cairo.jl/samples takes 10 seconds 
on my new iMac upgraded to Sierra and 2 seconds on my old one, which is too old 
to upgrade the OS to Sierra. I thought I'd try 'measuring' Julia on both the 
old iMac and the new one, to see if there was an overall degradation with the 
new OS. But it became a fractal problem of installation dependencies, so I've 
kind of given up. :)

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