> it just runs like utter garbage on all our older machines. interesting, it runs better on my dads 2011 11" MBA than on my 2013 13" rMBP, probably due to the r

> it just runs like utter garbage on all our older machines. interesting, it runs better on my dads 2011 11" MBA than on my 2013 13" rMBP, probably due to the retina display