How to improve the Swift project build time?

The Xcode 9.2 release notes mentioned an experimental feature that may improve Swift build times, enabled with the "BuildSystemScheduleInherentlyParallelCommandsExclusively" user default.

defaults write com.apple.dt.Xcode BuildSystemScheduleInherentlyParallelCommandsExclusively -bool NO

Note: According to the release notes it's an experimental feature which can "increase memory use during the build"


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