// Case study
CI/CD build time cut from 45 minutes to 11
A Next.js monorepo marketplace shaved pipeline duration with Turborepo remote cache, Docker layer reuse, and parallelised Playwright shards.
A B2B marketplace team (~28 engineers) on a Next.js 14 monorepo with three apps and a shared UI package. Forty-five-minute main-branch builds drove hotfix CI skips and eroded release confidence.
45 → 11 min
Main pipeline duration
Median build time
38 → 8 min
PR check duration
p95 under 15-minute policy
2/week → daily
Deploy frequency
Post-optimisation cadence
4
Playwright e2e shards
Parallelised from single-threaded 18 min
Delivered by Deepak Pathak · Published April 16, 2025 · 9 min read
Client context
A B2B marketplace team, Next.js 14 monorepo, three apps, shared UI package, GitHub Actions on self-hosted runners, averaged 45-minute main-branch builds. Engineers skipped CI on hotfixes; release confidence dropped.
Delivery notes
Profiling showed: cold npm ci every job (12 min), redundant full TypeScript build across packages (9 min), single-threaded Playwright e2e (18 min), and Docker images rebuilt without layer cache (6 min).
Our approach
Interventions: Turborepo with Vercel remote cache for shared packages; affected-package detection on pull requests; docker buildx with registry-backed layer cache; Playwright split into four shards with merge-reporter; pnpm instead of npm for install speed.
The challenge
Problems: initial cache poisoning from a bad turbo artifact, fixed with cache key rotation and main-only publish; self-hosted runners disk exhaustion from dangling images, prune cron added; flaky e2e on payment sandbox timeout, isolated with test clock injection.
Technical implementation
Governance: main must stay green; PR required checks under 15 minutes p95; weekly pipeline cost review.
Results & impact
Outcome: main pipeline 45 min → 11 min median; PR checks 38 min → 8 min; deploy frequency 2/week → daily. Team size ~28 engineers, identity not disclosed.
// Related services
CIN
AAU-8582
Startup India
DIPP83124
Founded
November 2020
Office
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