Add stateless doc, prefer stateless mode and disable legacy SSE by default #2553

Job	Run time
build (macos-latest, Release)	6m 35s
build (macos-latest, Debug)	7m 9s
build (ubuntu-latest, Debug)	12m 38s
build (ubuntu-latest, Release)	13m 9s
build (windows-latest, Release)	13m 21s
build (windows-latest, Debug)	12m 35s
publish-coverage	0s
	1h 5m 27s

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