Why static performance budgets matter
Performance budgets turn abstract goals into concrete constraints. When every route has a bundle ceiling, teams negotiate trade-offs earlier instead of after launch.
For portfolio and marketing sites, static generation keeps TTFB predictable and lets the CDN do most of the work.
Deferring heavy client islands
Not every interaction needs hydration on first paint. I isolate charts, theme toggles, and carousels behind dynamic imports and intersection observers.
- Keep the hero and primary copy server-rendered.
- Load non-critical widgets after
requestIdleCallbackor viewport entry. - Prefer CSS for layout shifts instead of client measurement.
Measuring LCP in production
Lab scores are useful, but field data tells you what real users experience. I pair Lighthouse CI with RUM snippets on key templates.
Ship fast first, then protect the budget with CI guardrails.
