I found these settings worked well on my old computer for most images. I don't know what kind of specs a MacBook air has. But I figure it probably is better than something that might have been mid-ranged in 2012.

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
Check out my store here or my free stuff here
I use Poser 13 and win 10