Add stateless doc, prefer stateless mode and disable legacy SSE by default #2513

Job	Run time
build (macos-latest, Debug)	7m 37s
build (windows-latest, Debug)	11m 58s
build (ubuntu-latest, Debug)	13m 24s
build (ubuntu-latest, Release)	14m 12s
build (windows-latest, Release)	13m 53s
build (macos-latest, Release)	6m 33s
publish-coverage	0s
	1h 7m 37s

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