Parallelize for performance, relationship resolver improvements #1328

Job	Run time
build_NetCore (Debug_NetCore)	1m 8s
build (6.8, Debug)	1m 26s
build_NetCore (Release_NetCore)	1m 1s
build (6.8, Release)	2m 21s
build (6.10, Debug)	1m 31s
build (6.10, Release)	1m 35s
build (6.12, Debug)	1m 48s
build (6.12, Release)	1m 31s
build (latest, Debug)	1m 40s
build (latest, Release)	2m 21s
	16m 22s

Provide feedback