Audits and optimizes all web-app assets for performance: images (Sharp AVIF/WebP variants, responsive `img`/`picture`/`srcset`/`sizes`), video (ffmpeg H.264/VP9/AV1 encoding, posters, lazy loading), animated GIF replacement with video or animated WebP/AVIF, web fonts (WOFF2 subsetting, font-display, preload), and SVG (SVGO, sprites, currentColor). Builds a per-asset delivery strategy from importance, viewport placement, and LCP status (fetchpriority, lazy loading, preload, caching, CLS). Use when auditing asset weight, fixing LCP/CLS, compressing video, replacing GIFs, subsetting fonts, or adapting asset markup for Next.js, React, Vite, Astro, SvelteKit, or Nuxt.
