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-# Frontend responsiveness audit
-
-Date: 2026-07-03
-
-## Scope and method
-
-Reviewed every user-facing page type in the authenticated product: login, home, browse, search, simulcast, top picks, watchlist, anime details, reviews, and playback. Measurements were taken in the in-app browser at a 1280x720 desktop viewport against an isolated copy of the local database. Timings include browser navigation and rendering; external-provider variability means they are directional rather than production percentiles.
-
-## Result
-
-The frontend architecture is generally healthy. It does not need an SPA rewrite. Home, search, watchlist, and anime details already use the right techniques: progressive fragments, optimistic mutations, request cancellation, client caching, lazy images, and background progress saves.
-
-Playback is the clear abandonment risk. The first tested episode exposed the page shell after 0.58s but remained on a spinner until it became playable at 9.75s. Manual episode switching also performs a full page navigation and took 2.59s before the next episode was playable.
-
-## Steps and health
-
-| Step | Surface | Observed readiness | Health |
-|---:|---|---:|---|
-| 1 | Login | 55ms page; 114ms sign-in navigation | Healthy |
-| 2 | Home | 531ms until catalog cards replaced skeletons | Healthy |
-| 3 | Browse | 980ms for 24 cards | Good |
-| 4 | Browse filtering | 621ms including a 350ms debounce | Healthy |
-| 5 | Search | 48ms shell; 282ms results including a 240ms debounce | Healthy |
-| 6 | Simulcast | 1.38s | Acceptable, cacheable |
-| 7 | Top picks | 44ms cached page; first computation ran about 10s in the background | Mixed: fast response, misleading empty state |
-| 8 | Watchlist | 158ms; mutations are optimistic | Healthy |
-| 9 | Anime details | 296ms useful hero; 538ms warm deferred completion | Healthy progressive loading |
-| 10 | Reviews | 1.20s; 234KB initial HTML | Needs payload reduction |
-| 11 | Watch episode 1 | 575ms shell; 9.75s playable | Poor |
-| 12 | Manual switch to episode 2 | 910ms shell; 2.59s playable | Needs asynchronous transition |
-
-## What is already good
-
-- Home sections load independently behind skeletons, so one provider call does not block the shell.
-- Search debounces, aborts stale requests, caches recent responses, and returns results quickly.
-- Watchlist icons and labels update optimistically before persistence completes.
-- Recommendation computation is already off the request path.
-- Anime details defer characters, statistics, release information, watch order, and recommendations.
-- Playback progress is debounced and uses `sendBeacon` on unload.
-- Episode titles are enriched asynchronously after the player shell renders.
-
-## Findings and recommendations
-
-### P0: reduce time to playable and remove full-page episode switches
-
-The initial player bundle is 1.16MB and is served without gzip or Brotli. A diagnostic minified build was 556KB raw and 175KB gzipped. Minify production bundles and enable text compression first.
-
-Manual episode links currently perform a normal page navigation, even though the autoplay path already fetches `/api/watch/episode/:anime/:episode`, swaps the video source, updates state, and pushes history without reloading. Extract that transition into a shared function and intercept manual episode, Previous, and Next clicks. Keep normal navigation as the error fallback.
-
-Add a short-lived, bounded cache plus singleflight for resolved `(anime, episode, mode)` stream sources and rewritten manifests. Prefetch the next episode when playback becomes stable, near the episode end, or on episode-link hover. The current fire-and-forget stream warm-up races the browser and does not give the proxy a reusable cached response.
-
-After three seconds, replace the anonymous spinner with phase text such as “Finding a source” or “Loading video,” plus Retry. Announce it through a live status region.
-
-### P1: fix static delivery
-
-Versioned asset URLs are already generated, but static responses have no `Cache-Control` and no content compression. The browser revalidated `app.js`, HTMX, CSS, and the player bundle on full navigations. Serve versioned assets with `Cache-Control: public, max-age=31536000, immutable`, and gzip/Brotli text responses.
-
-Resize the 1100x849, 392KB navigation logo for its roughly 40px display slot. The 512px favicon is also 113KB. Responsive, optimized PNG/WebP variants would reduce first-load transfer substantially.
-
-### P1: represent recommendation work honestly
-
-The recommendation cache correctly computes in the background, but a cold cache returns the same empty state used for “not enough watchlist data.” After adding an anime, the page said to add anime even while a roughly 10-second computation was active.
-
-Return distinct `empty`, `refreshing`, and `ready` states. Preserve stale recommendations while refreshing. On the first build, show a preparing state and use a small HTMX poll rather than requiring a manual reload. Start the refresh immediately after a watchlist mutation instead of waiting for the next recommendations request.
-
-### P2: remove duplicated or serial provider work
-
-- The Simulcast request checks the next season and then fetches the selected season serially. Cache latest-season discovery and seasonal results for 15-60 minutes with stale-while-refresh.
-- Cold anime details triggered duplicate canonical-episode refreshes from release-info and audio-availability fragments. Add singleflight keyed by anime ID around the episode refresh.
-- `BuildWatchData` performs stream resolution, progress loading, season loading, and segment loading serially. Run independent local/cache lookups concurrently after anime and canonical episodes are known.
-- Watchlist updates fetch full Jikan anime data before checking whether the anime row already exists. Check the local row first so status changes remain DB-only. Keep the optimistic client behavior.
-
-### P2: shrink Reviews
-
-The initial reviews response was 234KB of HTML and rendered full review bodies. Compressing HTML will help immediately. Then limit the initial rendered reviews or show a server-truncated preview with explicit expansion, loading more on demand.
-
-## Accessibility risks
-
-- The long player spinner is visual-only and gives assistive technology no progress or failure state.
-- Several player controls appeared without accessible names in the browser accessibility tree.
-- Skeleton regions do not expose a consistent loading announcement.
-
-Keyboard behavior, focus restoration after HTMX swaps, screen-reader output, zoom, and mobile reflow require separate hands-on checks; screenshots alone cannot establish compliance.
-
-## Suggested implementation order
-
-1. Minify bundles; add compression and immutable caching; optimize logo/favicon.
-2. Reuse the existing asynchronous episode transition for all manual episode controls.
-3. Cache/singleflight stream resolution and manifests; prefetch the next episode.
-4. Add recommendation `refreshing` state and automatic refresh.
-5. Cache Simulcast discovery, deduplicate detail episode refreshes, and trim Reviews.
-
-## Screenshots
-
-- `01-home.png` through `14-login.png` in this folder document the tested states.
-- `12-watch.png` captures the blocking playback spinner.
-- `13-watch-playable.png` captures the same page after metadata became available.
-
-## Detailed fix plans
-
-Implementation-ready plans for every recommendation are indexed in [`fixes/README.md`](fixes/README.md).