refactor: remove extra shared_mutex #4316

Job	Run time
build (server, debug, true, true)	5m 9s
build (server, debug, true, false)	3m 21s
build (server, debug, false, true)	5m 41s
build (server, debug, false, false)	3m 15s
build (server, release, true, true)	5m 15s
build (server, release, true, false)	6m 39s
build (server, release, false, true)	5m 34s
build (server, release, false, false)	4m 55s
build (client, debug, true, true)	5m 19s
build (client, debug, true, false)	6m 23s
build (client, debug, false, true)	4m 45s
build (client, debug, false, false)	4m 23s
build (client, release, true, true)	4m 5s
build (client, release, true, false)	3m 44s
build (client, release, false, true)	3m 52s
build (client, release, false, false)	4m 11s
	1h 16m 31s

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