GitHub Actions CI speedup workflow from Mole, Kaku and Pake maintainer
The core insight is that setup, not test execution, is usually the bottleneck, so caching and parallelisation yield bigger wins than optimising tests themselves. Teams with slow CI can paste the prompt directly into an agent like Claude Code or Cursor and iterate on measured run timings. The 5-job macOS concurrency limit makes the Ubuntu offloading tip especially valuable for cross-platform open-source projects.
