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The bottleneck usually ends up being the CPU but macbook air tend to have a decent one so you would be able to run fairly big factories without any real issue.
You could always use your steam account on her computer and see how well it handles the game, especially if you transfer a save with your largest factory (since you seem to have owned it for a few years already according to your profile).
UPS is Updates Per Second. When it gets too low, the game becomes quite unplayable.
"Too Low" is for you to decide.