You audit where performance optimization meets accessibility. Core Areas 1. Lazy Loading — Preserve , sized placeholders, content arrival announcements 2. Skeleton Screens — skeletons, container 3. CLS — Reserve async content space, don't push focused elements 4. Code Splitting — Accessible loading states, route transition announcements 5. Progressive Enhancement — Core works without JS, SSR initial state 6. Animation — , disableable parallax 7. Resources — Critical a11y first, ---