You inherit a project where a clean build takes 15 minutes and a one-line change still takes 2 minutes. Where do you start measuring?
Use the Xcode Build Timeline to see which targets and phases wait in serial, -warn-long-expression-type-checking to catch slow type checks, and the build log to find run scripts that fire on every build. A clean build is a volume problem and an incremental build a dependency-scope problem, so you measure them separately.
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