How To Audit CMS Performance
IntermediateQuick Answer
TL;DR
Audit CMS performance by testing page load speed with Lighthouse and WebPageTest, measuring API response times, analyzing JavaScript bundle sizes, checking image optimization, reviewing caching configuration, and testing under load. For headless CMS setups, audit the API layer and frontend independently — they have different bottlenecks. Schedule regular audits, because performance degrades gradually as content and features accumulate.
Key Takeaways
- Lighthouse (built into Chrome DevTools) and PageSpeed Insights provide Core Web Vitals scores and actionable recommendations in minutes.
- WebPageTest offers deeper analysis: waterfall charts, filmstrip view, and testing from multiple global locations.
- For headless CMS setups, audit the API layer (response time, cache hit rate) and the frontend (bundle size, rendering strategy) separately.
- Image optimization and JavaScript bundle size are the most common performance bottlenecks on CMS-powered sites.
- Set performance budgets and automate audits in CI/CD pipelines to catch regressions before they reach production.