perf: Memory optimizations #806

Job	Run time
units (17)	40s
dependencies (17)	33s
units (11)	39s
windows	1m 0s
units (8)	42s
units (21)	35s
javadoc	48s
lint	34s
clirr	42s
integration / integration-cassandra (11)	3m 1s
integration / integration-spanner (11)	9m 14s
units (8)	42s
units (11)	39s
dependencies (17)	33s
windows	1m 0s
javadoc	48s
integration / integration-spanner (11)	7m 42s
integration / integration-cassandra (11)	3m 1s
lint	34s
units (17)	40s
units (21)	35s
clirr	42s
	35m 24s

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