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Compiler Flags
Measuring build times for type checking
You can use the Swift compiler flags -warn-long-function-bodies and -warn-long-expression-type-checking to emit warnings for functions or expressions that take longer than a set time to type check. Surfacing these within your projects can help improve and manage type checking times which contribute to overall build times.
Source: Jesse Squires
Swift Concurrency flags
If you’re writing Swift concurrency code, add these compiler flags:
-Xfrontend -warn-concurrency -Xfrontend -enable-actor-data-race-checks(in Xcode: Other Swift Flags)
Warnings in Swift 5.5 identify unsafe constructs, will become errors in Swift 6.
Source: Ole Begemann