Performance Tuning for 100/100 Lighthouse

Ultra PDF Editor targets 100/100 Lighthouse scores on both mobile and desktop. The following optimizations align with Chrome’s performance scoring guidance.¹

Asset strategy

• Partial hydration: Only the editor island ships JavaScript. Marketing and documentation pages remain static HTML.
• Bundle splitting: pdf.js and pdf-lib live in their own chunk, loaded only when the editor initializes.
• Font loading: Inter, Poppins, and DM Mono load via self-hosted @fontsource packages with font-display: swap to avoid layout shifts.

Rendering

• Lazy hydration: The React editor uses client:idle so it waits until the browser is idle before downloading heavy assets.
• Canvas reuse: The viewer reuses a single <canvas> while switching pages to prevent DOM churn.

Caching and compression

• HTTP caching: Static assets ship with long-lived cache-control headers; HTML uses short TTLs so updates propagate.
• Brotli: Cloudflare automatically compresses assets with Brotli for modern browsers.

Runtime monitoring

• Integrate Lighthouse CI via npm run lhci to enforce score thresholds in CI.
• Use Chrome DevTools Performance panel to confirm the editor stays under 16 ms per frame while drawing.