How To Get A Perfect Lighthouse Score With A CMS
AdvancedQuick Answer
TL;DR
Achieving 100s across all four Lighthouse categories requires SSG or ISR for fast TTFB, optimized and properly sized images, minimal JavaScript with code splitting, semantic HTML with ARIA attributes, HTTPS with security headers, and complete meta tags with structured data. Use Next.js or Astro with a headless CMS. Third-party scripts — analytics, chat widgets, ad tags — are the single biggest obstacle to perfect scores.
Key Takeaways
- Performance: Use SSG/ISR for sub-50ms TTFB, serve next-gen image formats (WebP/AVIF), eliminate render-blocking scripts
- Accessibility: Semantic HTML elements, ARIA labels on interactive components, sufficient color contrast, keyboard navigation
- Best Practices: HTTPS everywhere, Content Security Policy headers, no deprecated APIs, no browser errors in console
- SEO: Unique title and meta description per page, canonical URLs, structured data (JSON-LD), mobile-friendly viewport