s3 slow note serial example #126

Job	Run time
build-arduino (release-v4.4, weather)	1m 38s
build (release-v4.4, calibration_helper)	1m 26s
build (release-v4.4, demo)	1m 33s
build (release-v4.4, dragon)	1m 24s
build (release-v4.4, grayscale_test)	1m 23s
build (release-v4.4, mpd_status)	1m 25s
build (release-v4.4, terminal)	1m 25s
build (release-v4.4, www-image)	1m 25s
build (release-v5.1, calibration_helper)	1m 40s
build (release-v5.1, demo)	1m 40s
build (release-v5.1, dragon)	1m 27s
build (release-v5.1, grayscale_test)	1m 32s
build (release-v5.1, mpd_status)	1m 34s
build (release-v5.1, terminal)	1m 39s
build (release-v5.1, www-image)	1m 40s
	22m 51s

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