Google Core Web Vitals–Mobilising and Testing Front-End Performance in Microservices
summary
John Lewis Partnership mobilises 40 service teams across 500+ microservices with a platform-led campaign: centralized Lighthouse leaderboard and Slack alerts, Graph dashboards, and tooling like WebPageTest and Chrome DevTools. Claims: 12,000+ deployments a year under 0.4% failure and measurable CWV gains (rank 19 mobile, 12 desktop). Concrete bug: CLS jumps 1500% to 0.3 → ~0 when an old hotspot component omits aspect ratio; swapping to a normal image reserves space and restores CLS to near zero. Continuous checks, alerts and reproducible test pages actually work.
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chapters (8)
- 0:00Introduction
- 1:53Microservices architecture
- 3:38Core Web Vitals
- 5:52Why Core Web Vitals matter
- 8:20Engaging service teams
- 13:19Competitor benchmarking
- 14:02CLS bug detection
- 21:52Q&A
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