MacOS is based on Linux (or more generically speaking, BSD UNIX). UNIX was designed from the ground up to be an efficient, multitasking operating system, and is the primary workhorse in the scientific community. Microsoft spent a lot of time making sure that each version of Windows was backward compatible with DOS until version 10 or 11. But they haven't evolved to be the elegant solution that UNIX (and MacOs) is. That's why your Windows box seems to slow down while it's downloading virus definitions in the background, yet a Mac doesn't. It's multitasking, pure and simple.
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'67 Piper Cherokee
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