Section 22 · Infrastructure Features
Front-End Performance
Core Web Vitals optimization and resource loading for SEO and user experience
This guide walks you through auditing a project's front-end performance, including Core Web Vitals and resource loading optimization.
The Goal: Fast, Measurable Rendering
Every page load should be snappy, and you should know immediately when a change makes it slower.
- Automated monitoring — Lighthouse CI catches performance regressions before they reach production
- Green Core Web Vitals — FCP, LCP, and CLS meet thresholds that keep users happy and SEO strong
- Preloaded fonts — Critical fonts load early, preventing Flash of Invisible/Unstyled Text
- Optimized CSS delivery — Critical CSS inlined or preloaded, non-critical loaded asynchronously
Before You Start
- Get the production URL from the user (or staging if production not available)
- Identify the build tool (Vite, Webpack, Next.js, etc.)
- Identify key pages to test (homepage, landing pages, marketing pages for SEO)
Page Rendering
Lighthouse CI integrated in pipeline to catch performance regressions automatically
“What's your Lighthouse score right now?”
FCP, LCP, CLS within acceptable thresholds; performance score tracked over time
“Would Google rank you lower than a competitor right now?”
Resource Loading
Above-the-fold fonts preloaded with correct attributes or font-display fallback configured
“Are fonts making users stare at blank text on load?”
Critical CSS inlined or preloaded to minimize render-blocking resources
“Is CSS blocking your first render right now?”