I wouldn't call it fast, these are several years old and no GPU, Thunderbolt, etc. support still. It's steady, but not fast.

If I was to do it myself, it would take centuries. I guess it's a matter of perspective :-).

	▲	vbezhenar an hour ago \| parent [-]
		And if Apple did it themselves, like Intel or AMD do, it would be released at the same time as macOS.