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by 1letterunixname 1178 days ago
SMP was sort-of included mid System 7. I doubt many programs took advantage of it because the programming model isn't like async GCD-based with origins in NeXTSTEP (NS...) like it is now in macOS X+. I'm guessing there wasn't much to take advantage of multiple processors except specialized professional apps like Photoshop, Illustrator, PageMaker, QuarkXPress, LightWave, Maya, and not much else. That's the only reason they could justify their prices, effectively competing in a similar space as NeXTSTEP was.