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perf(dashboard): Preload first-load chunks and load the drawer on demand - #2738
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The client build writes a manifest of its entry and every chunk the entry imports statically. The page shell emits a modulepreload link for each chunk, so the browser fetches them beside the entry instead of after it. The manifest also names the entry, which replaces the newest-mtime scan. The side drawer opens only after a click, so base-ui's drawer now loads with the first open.
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BYK
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…ets (#2757) The page shell had the full Tailwind stylesheet (177 KB raw / 28 KB gzip) inline in every `no-store` HTML response. It also loaded Inter and Outfit through a render-blocking Google Fonts `@import`, which needs two more origins. The header and transcript avatar was a 76 KB PNG that was not hashed. - The client build now bundles `src/styles.css` (self-hosted fontsource variable fonts + `dist/tailwind.css`) into `styles-[hash].css`. The fonts are `*-[hash].woff2` files under `/_junior/dashboard/assets`, the same immutable prefix as the JS from #2725. Fonts keep `font-display: swap`. - The shell links the stylesheet and preloads the two Latin font files. The other subsets load only when a page uses them. The forbidden page uses the same stylesheet link. - The avatar is an 88×88 (2× of `size-11`) hashed WebP: 3.2 KB. No PNG fallback, because every supported browser decodes WebP. `/_junior/dashboard/avatar.png` stays for older cached clients and the install icons. - Binary public assets are embedded as base64 and served with the content type from their extension. - Core no longer copies `tailwind.css` into server output. Nothing reads it now. ### Numbers (`/conversations`, mock conversations, production build) | | before | after | |---|---|---| | HTML raw / gzip / br | 189,104 / 31,888 / 24,789 B | **11,141 / 2,902 / 2,292 B** | | Third-party origins | fonts.googleapis.com, fonts.gstatic.com | **none** | | Render-blocking chain | HTML → Google CSS → gstatic woff2 | HTML → hashed CSS (fonts preloaded in parallel) | | `modulepreload` links | 58 | 58 (unchanged, see below) | | Avatar | 76,539 B PNG, revalidated | 3,206 B WebP, immutable | | Cold first load, same-origin br (HTML + head assets) | 498,513 B | 580,255 B | On a cold load, the first-load figure goes up because the CSS (23 KB br) and the Latin fonts (48 + 32 KB) now come from our origin instead of Google. The browser fetched about the same font bytes from gstatic before. On every later load, all of that is cached as immutable, so the HTML is the only transfer: **24.8 KB → 2.3 KB br**. ### Not in this PR: merging small chunks esbuild has no minimum chunk size and no manual chunk grouping. 37 of the 58 preloaded chunks are under 4 KB, and 19 are under 1 KB. In an experiment, rolldown 1.2.15 with default splitting gave 21 static imports instead of 58 and 419,654 B br instead of 473,724 B, with the route splitting from #2734/#2738 kept. That needs the client build moved from tsup to rolldown and checked at runtime, so it is a separate follow-up. ### Screenshots (mock conversations, 1440×900, dark) The screenshots should look the same. Fonts loaded before: `Inter 400/500/600/700, Outfit 500` from Google. After: `Inter Variable 100–900, Outfit Variable 100–900` from the assets prefix. | before | after | |---|---| |  |  | |  |  | Header avatar at 4× zoom, PNG (left) and WebP (right):  ### Checks - `pnpm test:e2e:dashboard` (playwright, local chromium): 100 passed - `pnpm --filter @sentry/junior-dashboard test`: 370 passed, 1 failed. The failure is `dashboard-output.test.ts`. It also fails on clean `main` in this sandbox: the nitro build reports `MISSING_EXPORT nitroIntegration` from a hoisted `@sentry/server-utils@11.6.0`. CI should run it. - `nitro-plugin-module.test.ts` and `app-config.test.ts`: 42 passed - typecheck (dashboard, core), dashboard and core oxlint, `file-length`, `dashboard-style`, `test-architecture`, `package:lint`, and the pre-push `pnpm lint`: pass <!-- junior-request-attribution:start --> via @BYK. <!-- junior-request-attribution:end --> <!-- junior-session-footer:start --> <!-- junior-conversation-id:agent%3Afbc3c9e7ecae9c7dc9aa0a400563ce91 --> -- [View Session in Sentry](https://sentry.sentry.io/explore/conversations/agent%3Afbc3c9e7ecae9c7dc9aa0a400563ce91/?project=4510944073809921) <!-- junior-session-footer:end --> Co-authored-by: sentry-junior[bot] <264270552+sentry-junior[bot]@users.noreply.github.com> Co-authored-by: BYK <126780+BYK@users.noreply.github.com>
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Follow-up to #2734. That PR split the first load into an entry and 54 chunks, but the browser finds the chunks only after it has downloaded and parsed the 690 KB entry. That costs one more round trip on every load that misses the cache.
Preload hints
tsup.client.config.ts) writesdist/client-manifest.json. It lists the entry and every chunk the entry imports statically, taken from the esbuild metafile.<link rel="modulepreload">in<head>for each chunk. The server build embeds the manifest, and checks that every name in it is indist/public.client-*.js.Drawer on demand
Drawerlazy-loadsDrawerContent, so base-ui's drawer (swipe dismiss, virtual keyboard provider) leaves the first load. A drawer opens only after a click.Checked in a browser (mock dashboard on a Conversation page):
chunks/DrawerContent-*.jsonce. Later opens fetch nothing. Escape closes it.Subagent drawer, desktop and mobile:
Checks:
pnpm --filter @sentry/junior-dashboard typecheck,pnpm lintandpnpm file-length:checkpass.dashboard-output.test.ts, which fails the same way on main in this sandbox (nitroIntegrationis not exported by@sentry/server-utils@11.6.0).e2e/conversations-mobile.spec.ts:615("keeps the message in view while earlier history and late content load") is flaky on main too: 3 of 16 runs failed on main.Not done here:
remark-gfmalso pulls in about 20 KB of markdown serialization code that the dashboard never uses. Removing it needs two direct dependencies.via @BYK.
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View Session in Sentry