Parallelize for performance, relationship resolver improvements #1330

Job	Run time
build_NetCore (Debug_NetCore)	1m 2s
build_NetCore (Release_NetCore)	1m 3s
build (6.8, Debug)	1m 35s
build (6.8, Release)	2m 54s
build (6.10, Debug)	1m 22s
build (6.10, Release)	1m 31s
build (6.12, Debug)	1m 30s
build (6.12, Release)	1m 52s
build (latest, Debug)	1m 31s
build (latest, Release)	2m 10s
	16m 30s

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