Add documentation for caching feature #1919

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Job	Run time
3.10-dev-build	1m 31s
3.10-build	1m 31s
3.11-build	1m 29s
3.11-dev-build	1m 31s
3.12-build	1m 32s
3.12-dev-build	1m 32s
	9m 6s