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Benchmarks and engineering notes on running macOS and iOS CI on GitHub Actions. Numbers come from real, public workflows and link to the runs.

• How much faster is macOS CI on Manzanita? Five open-source projects, measured

  Five public iOS/macOS repos, one runs-on line changed, run on both. 1.5× to 4.7× on real jobs, with the mixed results shown too. September 9, 2026