Parallelize for performance, relationship resolver improvements #1333

Job	Run time
build_NetCore (Debug_NetCore)	1m 11s
build (6.8, Debug)	1m 34s
build_NetCore (Release_NetCore)	1m 5s
build (6.8, Release)	2m 43s
build (6.10, Debug)	1m 58s
build (6.10, Release)	1m 34s
build (6.12, Debug)	1m 35s
build (6.12, Release)	1m 45s
build (latest, Debug)	1m 43s
build (latest, Release)	2m 11s
	17m 19s

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