Our Lean 4 + mathlib project used to spend 41 minutes in CI on every single PR. Today, the worst case...
Our Lean 4 + mathlib project used to spend 41 minutes in CI on every single PR. Today, the worst case — rebuilding the heaviest files from scratch — takes 12 minutes, and an ordinary PR finishes in a few minutes on an incremental build.
What we fixed
Before
After
Kernel axiom audit
You push a critical hotfix, switch branches—and your CI is still running 30 minutes later. In my...
TL;DR: Use per-test coverage data to build a reverse map (file → tests that touch it). Git diff + map...
Claude refactored 100 functions in my Python service. CI was green. Mutation tests were green. Two weeks later, on-call paged me…
Claude Code dropped median time-to-first-commit from 47 minutes to 9 minutes across 200 internal...
The CI job just hit 28 minutes. Again. You pull up the duration report expecting to blame a bloated...
A 45-minute CI pipeline is a tax on every engineer every day. If your team runs 50 builds per day and...
