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AI-Assisted Profiling Cuts Lean 4 CI Build Time from 41 Minutes to 12

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A Lean 4 and mathlib formal verification project reduced its continuous integration build time from 41 minutes to roughly 12 minutes at worst case, with typical pull requests completing in just a few minutes. The improvements came in three rounds, each following a structured problem-hypothesis-verification-fix approach, and in every round the initially suspected cause turned out to be innocent. A kernel axiom audit — a mandatory check ensuring no proofs were bypassed using Lean's 'sorry' escape hatch — was also slashed from over seven minutes to 11 seconds. Notably, nearly all measurement and implementation work across the three rounds was carried out by AI agents, with the human author primarily approving targets and accepting results. The project, a formal verification of a software architecture theory built on over 4,000 declarations, runs its CI pipeline on GitHub Actions.

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