C · Speed & ScaleIntermediate50 min read
7. Caching & pipeline speed
CI/CD Pipelines · 48 pages source format
Slow pipelines get skipped. Cache npm/pip/maven dependencies. Measure before and after.
What you'll learn
- actions/cache
- Cache keys
- Dependency review
- Parallel jobs
Dependency cache
actions/cache with path and key from lockfile hash. Restore on cache hit.
- uses: actions/cache@v4
with:
path: ~/.npm
key: ${{ runner.os }}-npm-${{ hashFiles('**/package-lock.json') }}Do this now
Add cache step. Compare workflow duration before/after in README.
Clear?
Cache invalidation
Key includes lockfile hash — dependency change busts cache automatically.
Do this now
Bump dependency. Confirm cache miss then new cache save.
Clear?
Parallel jobs
lint, test, build as separate jobs — fail fast on lint before expensive test.
Do this now
Split into lint + test jobs. lint runs first or in parallel.
Clear?
Speed budget
Document target times. Alert when PR check exceeds 10 min.
Do this now
Add timing note to CI.md from last 5 runs.
Clear?