diff --git a/CHANGELOG.md b/CHANGELOG.md
index 564529c9..e2cf935a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -60,6 +60,7 @@ latest tag; security fixes land on the latest release (see `SECURITY.md`).
 
 - TypeScript 7: the typecheck gate runs on the stable native (Go) compiler — `typescript@^7.0.2` installed under the `typescript7` npm alias, invoked by path (`bun node_modules/typescript7/bin/tsc --noEmit`) from `check`, `typecheck`, `typecheck:watch`, and the lefthook pre-commit hook. The classic `typescript@^6` package keeps the `typescript` name because Next 16.2's build-time type checking and dev server require the classic JS compiler API, which the TS7 native package does not ship — when Next supports TS7 directly, the alias flips to owning the name. The preview-era machinery is gone: the `@typescript/native-preview` (`tsgo`) dependency, the `typecheck:tsc`/`typecheck:compare` cross-check scripts, and the obsolete `typescript.experimental.useTsgo` VS Code flag. Operational wins from the native compiler: the pre-commit typecheck drops `--incremental false` (the TS7 alias is the sole `.tsbuildinfo` writer, so the ~4x-faster warm cache is safe) and `typecheck:watch` uses TS7's rebuilt native file watcher.
 - Whole-codebase maintainability pass (net −1.2k lines): removed a dead Zustand WebGL-tunnel store; deduped the Shopify integration install path through `installBundle` and the fluid/flowmap pointer handling through a shared `usePointerInput`; split the 1k-line `ast-transforms.ts` into focused `helpers`/`remove-ops`/`add-ops`/`index` modules (behind a barrel re-export) and trimmed `setup-project.ts` under 1k; made bundle-key typing honest (`BundleId` + a `getBundle` accessor for the wider `RemovableId` space) and removed dishonestly-optional types (`CartLineItem.id`, `CartMeta`, a discriminated `CanvasContextValue`); and routed server-side integration env reads through the typed `@/lib/env` accessor. No consumer-facing API change.
+- Next.js 16.3 preview: bumped `next` to the `preview` dist-tag, enabled top-level `partialPrefetching: true` (the 16.3 successor to `experimental.prefetchInlining`), removed the now-superseded `experimental.prefetchInlining` flag from the `experimental` block, and replaced the placeholder `app/loading.tsx` with an accessible skeleton shell (`role="status"`, `aria-busy="true"`, `sr-only` label, `animate-pulse` bars) demonstrating the instant-navigation loading pattern. Added throwaway, branch-only demo routes under `app/instant-nav-demo/` (hub + `fast`/`slow`/`[item]` routes exercising shell prefetch, partial streaming via `<Suspense>`/`connection()`, and a reused dynamic-route `loading.tsx` shell) so the preview deploy can actually test instant navigations; reachable at `/instant-nav-demo` and never merged to main. Also enabled the 16.3 Turbopack experimental flags `turbopackFileSystemCacheForBuild` (persistent build cache) and `turbopackRustReactCompiler` (native React Compiler, pairs with `reactCompiler: true`) to validate build-perf on the same preview.
 - Dependencies: bumped every package to its latest version. The only breaking change was `tempus` dev.18, whose `TempusCallback` moved from positional `(time, deltaTime)` arguments to a single `TempusState` object (`{ time, deltaTime, frame, budget }`) and deprecated the `priority` option in favor of `order` — migrated all seven call sites (the GSAP, Lenis, marquee, and WebGL RAF runtimes, the `lib/utils/raf` write queue, and the dev `Stats` overlay). Also bumped `@base-ui/react` 1.6, `next-sanity` 13.1, `@types/node` 26, `deslop-cli` 0.5.8, `@biomejs/biome` 2.5.1, Storybook 10.4.6, Tailwind 4.3.1, and `@typescript/native-preview`; `actions/checkout` 6 → 7 in CI. Supersedes #251–254. (#255)
 - Dependencies: bumped the Sanity toolchain to v6 (`sanity`, `@sanity/vision`, `groq` → `^6.1.0`) — Studio v6's breaking changes (Node 20 dropped, `auth.providers` replace semantics, `enableLegacySearch` removed) don't touch the integration's API surface, so forks on Node ≥ 22 update without code changes. Also bumped `@biomejs/biome` 2.5.0, `deslop-cli` 0.0.25, and `@typescript/native-preview`. Biome 2.5's newly-enabled rules required a `<title>` on `darkroom.svg` (`noSvgWithoutTitle`) and an import-spacing fix in generated `sanity.types.ts` (`organizeImports`); the inline version `<Script>` carries a documented `useInlineScriptId` ignore (the `id` is present — biome mis-detects JSX-children content). Supersedes #221–226. (#228)
 - Integration registry is single-source: `INTEGRATION_BUNDLES` keys are typed against `RemovableId` from `lib/integrations/registry`, `prepare-handoff` matches integrations by id, and `next.config.ts` cleanup runs through typed ts-morph AST ops — the regex `updateNextConfig` is deleted.
diff --git a/app/instant-nav-demo/README.md b/app/instant-nav-demo/README.md
new file mode 100644
index 00000000..38051084
--- /dev/null
+++ b/app/instant-nav-demo/README.md
@@ -0,0 +1,17 @@
+# instant-nav-demo — throwaway
+
+These routes exist ONLY on the `next/16.3-preview` branch to exercise Next.js
+16.3 Instant Navigations (`partialPrefetching`) on a real deploy. They are NOT
+starter content and must never merge to `main`.
+
+- `page.tsx` — hub linking to the demo routes (prefetch fires on hover/viewport)
+- `fast/` — synchronous route, the prefetched shell is the whole page
+- `slow/` — shell paints immediately; an inner `<Suspense>` panel streams in
+  after a delay (`connection()` + artificial wait) — partial prerendering
+- `[item]/` — dynamic route that suspends at the top level, so its `loading.tsx`
+  shell is shown on the way in and reused identically for every param value
+  (`/instant-nav-demo/alpha`, `/instant-nav-demo/bravo`,
+  `/instant-nav-demo/charlie`)
+
+Reach it on the preview at `/instant-nav-demo`. Delete this whole folder before
+adopting anything from this branch.
diff --git a/app/instant-nav-demo/[item]/loading.tsx b/app/instant-nav-demo/[item]/loading.tsx
new file mode 100644
index 00000000..e258a3b3
--- /dev/null
+++ b/app/instant-nav-demo/[item]/loading.tsx
@@ -0,0 +1,17 @@
+export default function Loading() {
+  return (
+    // <output> has an implicit role="status"; `flex` overrides its default
+    // inline display, so the layout is unchanged.
+    <output
+      aria-busy="true"
+      className="gap-3 flex min-h-dvh flex-col items-center justify-center font-mono"
+    >
+      <span className="sr-only">Loading item</span>
+      <div className="w-40 animate-pulse space-y-2">
+        <div className="h-2 rounded bg-current opacity-20" />
+        <div className="h-2 rounded w-3/4 bg-current opacity-20" />
+        <div className="h-2 rounded w-1/2 bg-current opacity-10" />
+      </div>
+    </output>
+  )
+}
diff --git a/app/instant-nav-demo/[item]/page.tsx b/app/instant-nav-demo/[item]/page.tsx
new file mode 100644
index 00000000..d43670f1
--- /dev/null
+++ b/app/instant-nav-demo/[item]/page.tsx
@@ -0,0 +1,41 @@
+import { connection } from 'next/server'
+
+import { Wrapper } from '@/components/layout/wrapper'
+import { Link } from '@/components/ui/link'
+
+export const metadata = {
+  title: 'Dynamic route — Instant Navigations demo',
+}
+
+export default async function ItemPage({
+  params,
+}: {
+  params: Promise<{ item: string }>
+}) {
+  // `params` and `connection()` are independent, so they resolve together.
+  const [{ item }] = await Promise.all([params, connection()])
+  // The delay stays sequential on purpose — a slow route is what this demo is
+  // demonstrating.
+  await new Promise((resolve) => setTimeout(resolve, 1200))
+
+  return (
+    <Wrapper theme="dark">
+      <section className="py-24 dr-layout-grid min-h-dvh content-center font-mono">
+        <div className="gap-6 col-span-full flex flex-col dt:col-start-2 dt:col-end-11">
+          <h1 className="text-2xl uppercase">Dynamic route: {item}</h1>
+          <p className="max-w-prose opacity-70">
+            One reusable shell is prefetched for this route and shown on the way
+            in (see the skeleton). It is identical for every param value —{' '}
+            <code>alpha</code>, <code>bravo</code>, and <code>charlie</code>.
+          </p>
+          <Link
+            className="underline underline-offset-4"
+            href="/instant-nav-demo"
+          >
+            ← Back to demo hub
+          </Link>
+        </div>
+      </section>
+    </Wrapper>
+  )
+}
diff --git a/app/instant-nav-demo/fast/page.tsx b/app/instant-nav-demo/fast/page.tsx
new file mode 100644
index 00000000..98ed1bcb
--- /dev/null
+++ b/app/instant-nav-demo/fast/page.tsx
@@ -0,0 +1,28 @@
+import { Wrapper } from '@/components/layout/wrapper'
+import { Link } from '@/components/ui/link'
+
+export const metadata = {
+  title: 'Fast route — Instant Navigations demo',
+}
+
+export default function FastPage() {
+  return (
+    <Wrapper theme="dark">
+      <section className="py-24 dr-layout-grid min-h-dvh content-center font-mono">
+        <div className="gap-6 col-span-full flex flex-col dt:col-start-2 dt:col-end-11">
+          <h1 className="text-2xl uppercase">Fast route</h1>
+          <p className="max-w-prose opacity-70">
+            Fully static — no async data. The prefetched shell IS the page, so
+            navigation here is immediate with nothing to stream.
+          </p>
+          <Link
+            className="underline underline-offset-4"
+            href="/instant-nav-demo"
+          >
+            ← Back to demo hub
+          </Link>
+        </div>
+      </section>
+    </Wrapper>
+  )
+}
diff --git a/app/instant-nav-demo/page.tsx b/app/instant-nav-demo/page.tsx
new file mode 100644
index 00000000..b0fa0ba4
--- /dev/null
+++ b/app/instant-nav-demo/page.tsx
@@ -0,0 +1,53 @@
+import { Wrapper } from '@/components/layout/wrapper'
+import { Link } from '@/components/ui/link'
+
+export const metadata = {
+  title: 'Instant Navigations demo',
+}
+
+const ITEMS = ['alpha', 'bravo', 'charlie']
+
+export default function InstantNavDemoPage() {
+  return (
+    <Wrapper theme="dark">
+      <section className="py-24 dr-layout-grid min-h-dvh content-center font-mono">
+        <div className="gap-6 col-span-full flex flex-col dt:col-start-2 dt:col-end-11">
+          <h1 className="text-2xl uppercase">Instant Navigations demo</h1>
+          <p className="max-w-prose opacity-70">
+            Throwaway routes for exercising Next.js 16.3 shell-based
+            prefetching. Hover a link to prefetch its shell, then click to see
+            the shell paint instantly while data streams in.
+          </p>
+
+          <nav className="gap-3 flex flex-col">
+            <Link
+              className="underline underline-offset-4"
+              href="/instant-nav-demo/fast"
+            >
+              → Fast route (synchronous, paints immediately)
+            </Link>
+            <Link
+              className="underline underline-offset-4"
+              href="/instant-nav-demo/slow"
+            >
+              → Slow route (shell first, panel streams in)
+            </Link>
+            {ITEMS.map((item) => (
+              <Link
+                key={item}
+                className="underline underline-offset-4"
+                href={`/instant-nav-demo/${item}`}
+              >
+                → Dynamic route: {item} (one shell, reused per param)
+              </Link>
+            ))}
+          </nav>
+
+          <Link className="underline underline-offset-4 opacity-60" href="/">
+            ← Home
+          </Link>
+        </div>
+      </section>
+    </Wrapper>
+  )
+}
diff --git a/app/instant-nav-demo/slow/page.tsx b/app/instant-nav-demo/slow/page.tsx
new file mode 100644
index 00000000..da7067e5
--- /dev/null
+++ b/app/instant-nav-demo/slow/page.tsx
@@ -0,0 +1,65 @@
+import { connection } from 'next/server'
+import { Suspense } from 'react'
+
+import { Wrapper } from '@/components/layout/wrapper'
+import { Link } from '@/components/ui/link'
+
+export const metadata = {
+  title: 'Slow route — Instant Navigations demo',
+}
+
+// connection() marks this subtree runtime-dynamic; the artificial delay makes
+// the stream visible. Lives inside <Suspense> so the page shell paints
+// immediately and only this panel streams in (partial prerendering under
+// cacheComponents).
+async function StreamedPanel() {
+  await connection()
+  await new Promise((resolve) => setTimeout(resolve, 1500))
+  return (
+    <p className="max-w-prose opacity-90">
+      Streamed in after ~1.5s. The heading and back-link above were already on
+      screen — only this panel waited on the server.
+    </p>
+  )
+}
+
+function PanelSkeleton() {
+  return (
+    // `block` is required: <output> is inline by default, and `w-40` would do
+    // nothing on an inline element. The implicit role="status" replaces the
+    // explicit one.
+    <output aria-busy="true" className="w-40 block">
+      <span className="sr-only">Loading panel</span>
+      <div aria-hidden className="animate-pulse space-y-2">
+        <div className="h-2 rounded bg-current opacity-20" />
+        <div className="h-2 rounded w-3/4 bg-current opacity-20" />
+        <div className="h-2 rounded w-1/2 bg-current opacity-10" />
+      </div>
+    </output>
+  )
+}
+
+export default function SlowPage() {
+  return (
+    <Wrapper theme="dark">
+      <section className="py-24 dr-layout-grid min-h-dvh content-center font-mono">
+        <div className="gap-6 col-span-full flex flex-col dt:col-start-2 dt:col-end-11">
+          <h1 className="text-2xl uppercase">Slow route</h1>
+          <p className="max-w-prose opacity-70">
+            The shell (this heading and the link below) paints instantly. The
+            panel streams in once the server resolves.
+          </p>
+          <Suspense fallback={<PanelSkeleton />}>
+            <StreamedPanel />
+          </Suspense>
+          <Link
+            className="underline underline-offset-4"
+            href="/instant-nav-demo"
+          >
+            ← Back to demo hub
+          </Link>
+        </div>
+      </section>
+    </Wrapper>
+  )
+}
diff --git a/app/loading.tsx b/app/loading.tsx
index fc97e1a2..f3053682 100644
--- a/app/loading.tsx
+++ b/app/loading.tsx
@@ -3,8 +3,19 @@
 // and fails prerendering (e.g. /studio). Keep this fallback dependency-free.
 export default function Loading() {
   return (
-    <div className="flex min-h-dvh flex-col items-center justify-center font-mono uppercase">
-      <p>Cooking...</p>
-    </div>
+    // <output> carries an implicit role="status", so the role is redundant.
+    // `flex` overrides the element's default inline display, so the layout is
+    // unchanged.
+    <output
+      aria-busy="true"
+      className="gap-3 flex min-h-dvh flex-col items-center justify-center font-mono"
+    >
+      <span className="sr-only">Loading</span>
+      <div className="w-40 animate-pulse space-y-2">
+        <div className="h-2 rounded bg-current opacity-20" />
+        <div className="h-2 rounded w-3/4 bg-current opacity-20" />
+        <div className="h-2 rounded w-1/2 bg-current opacity-10" />
+      </div>
+    </output>
   )
 }
diff --git a/bun.lock b/bun.lock
index b95d6dbb..8cd9fed6 100644
--- a/bun.lock
+++ b/bun.lock
@@ -18,7 +18,7 @@
         "gsap": "^3.15.0",
         "hamo": "^1.0.1",
         "lenis": "^1.3.25",
-        "next": "16.2.12",
+        "next": "16.3.0-preview.10",
         "next-sanity": "^13.2.3",
         "postprocessing": "^6.39.4",
         "react": "19.2.8",
@@ -34,7 +34,7 @@
         "@clack/prompts": "^1.7.0",
         "@csstools/postcss-global-data": "^4.0.0",
         "@happy-dom/global-registrator": "^20.11.1",
-        "@next/bundle-analyzer": "16.2.12",
+        "@next/bundle-analyzer": "16.3.0-preview.10",
         "@playwright/test": "1.62.0",
         "@sanity/vision": "^6.7.0",
         "@storybook/addon-mcp": "^0.7.0",
@@ -599,53 +599,57 @@
 
     "@img/colour": ["@img/colour@1.1.0", "", {}, "sha512-Td76q7j57o/tLVdgS746cYARfSyxk8iEfRxewL9h4OMzYhbW4TAcppl0mT4eyqXddh6L/jwoM75mo7ixa/pCeQ=="],
 
-    "@img/sharp-darwin-arm64": ["@img/sharp-darwin-arm64@0.34.5", "", { "optionalDependencies": { "@img/sharp-libvips-darwin-arm64": "1.2.4" }, "os": "darwin", "cpu": "arm64" }, "sha512-imtQ3WMJXbMY4fxb/Ndp6HBTNVtWCUI0WdobyheGf5+ad6xX8VIDO8u2xE4qc/fr08CKG/7dDseFtn6M6g/r3w=="],
+    "@img/sharp-darwin-arm64": ["@img/sharp-darwin-arm64@0.35.3", "", { "optionalDependencies": { "@img/sharp-libvips-darwin-arm64": "1.3.2" }, "os": "darwin", "cpu": "arm64" }, "sha512-RMnFX7YQsMoh7lWfcM4NEHHymBX/rLuKNPVM84XE9ONPcaSCDgE7CHIHpSgPcO2xcRthgBy1HfNO319mwhIAkg=="],
 
-    "@img/sharp-darwin-x64": ["@img/sharp-darwin-x64@0.34.5", "", { "optionalDependencies": { "@img/sharp-libvips-darwin-x64": "1.2.4" }, "os": "darwin", "cpu": "x64" }, "sha512-YNEFAF/4KQ/PeW0N+r+aVVsoIY0/qxxikF2SWdp+NRkmMB7y9LBZAVqQ4yhGCm/H3H270OSykqmQMKLBhBJDEw=="],
+    "@img/sharp-darwin-x64": ["@img/sharp-darwin-x64@0.35.3", "", { "optionalDependencies": { "@img/sharp-libvips-darwin-x64": "1.3.2" }, "os": "darwin", "cpu": "x64" }, "sha512-Xo+5uFBtLN0BKqieTxiFzFPQAUlBbbH5iBKyRX/z1JrbnYsHTfKJnUfL8+p2TPXr1pXqao4eeL4Rl144uDpK9w=="],
 
-    "@img/sharp-libvips-darwin-arm64": ["@img/sharp-libvips-darwin-arm64@1.2.4", "", { "os": "darwin", "cpu": "arm64" }, "sha512-zqjjo7RatFfFoP0MkQ51jfuFZBnVE2pRiaydKJ1G/rHZvnsrHAOcQALIi9sA5co5xenQdTugCvtb1cuf78Vf4g=="],
+    "@img/sharp-freebsd-wasm32": ["@img/sharp-freebsd-wasm32@0.35.3", "", { "dependencies": { "@img/sharp-wasm32": "0.35.3" }, "os": "freebsd" }, "sha512-lUxcqWIj2wMQ9BrwNjngcr1gWUr5xgaGThBRqPPalIC2n67Cqj1uPh8NnA/ZhAg8hUbKl+kVHKwgUIwe6ZYPrg=="],
 
-    "@img/sharp-libvips-darwin-x64": ["@img/sharp-libvips-darwin-x64@1.2.4", "", { "os": "darwin", "cpu": "x64" }, "sha512-1IOd5xfVhlGwX+zXv2N93k0yMONvUlANylbJw1eTah8K/Jtpi15KC+WSiaX/nBmbm2HxRM1gZ0nSdjSsrZbGKg=="],
+    "@img/sharp-libvips-darwin-arm64": ["@img/sharp-libvips-darwin-arm64@1.3.2", "", { "os": "darwin", "cpu": "arm64" }, "sha512-9J6ypZFpQBj4YnePGoq/S38w6nz+vqg5WZLrLGY4YuSemdMq47GMLBPO42MzwdGwpg/agZ7xzZcFHa48xlywfg=="],
 
-    "@img/sharp-libvips-linux-arm": ["@img/sharp-libvips-linux-arm@1.2.4", "", { "os": "linux", "cpu": "arm" }, "sha512-bFI7xcKFELdiNCVov8e44Ia4u2byA+l3XtsAj+Q8tfCwO6BQ8iDojYdvoPMqsKDkuoOo+X6HZA0s0q11ANMQ8A=="],
+    "@img/sharp-libvips-darwin-x64": ["@img/sharp-libvips-darwin-x64@1.3.2", "", { "os": "darwin", "cpu": "x64" }, "sha512-m2pW1n6cns9VaubNwsZ+c3CRYjxNQWgJ5gPlnL1nbBcpkBvFm6SCFN5o0psFHI8w9n11NKhFkeEDns98tiqbEw=="],
 
-    "@img/sharp-libvips-linux-arm64": ["@img/sharp-libvips-linux-arm64@1.2.4", "", { "os": "linux", "cpu": "arm64" }, "sha512-excjX8DfsIcJ10x1Kzr4RcWe1edC9PquDRRPx3YVCvQv+U5p7Yin2s32ftzikXojb1PIFc/9Mt28/y+iRklkrw=="],
+    "@img/sharp-libvips-linux-arm": ["@img/sharp-libvips-linux-arm@1.3.2", "", { "os": "linux", "cpu": "arm" }, "sha512-1eMLzy92I4J6rmi4mAT8yC3HxOtniyGELlzGbNMLLeqe052ahFQ0h6LFq+lh5DsDIdYViIDst08abvSbcEdLXQ=="],
 
-    "@img/sharp-libvips-linux-ppc64": ["@img/sharp-libvips-linux-ppc64@1.2.4", "", { "os": "linux", "cpu": "ppc64" }, "sha512-FMuvGijLDYG6lW+b/UvyilUWu5Ayu+3r2d1S8notiGCIyYU/76eig1UfMmkZ7vwgOrzKzlQbFSuQfgm7GYUPpA=="],
+    "@img/sharp-libvips-linux-arm64": ["@img/sharp-libvips-linux-arm64@1.3.2", "", { "os": "linux", "cpu": "arm64" }, "sha512-dqVSFynCox4C/J8kT16V7SIFAns0IjgLwkvYT7p8LQVmJ5OS5b6tI9IGflxTeuBS//zXeFIUbwt5dwxyZ17cnA=="],
 
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+    "@img/sharp-webcontainers-wasm32": ["@img/sharp-webcontainers-wasm32@0.35.3", "", { "dependencies": { "@img/sharp-wasm32": "0.35.3" }, "cpu": "none" }, "sha512-2rnq7bX3NzeR2T4YWgz8qiG4h3TSdMe+vN1iQXpJleSJ3SM5zQ8Fy2SyyXAWlbxpEZ2Y+Z4u1BePgJEYbSy80Q=="],
 
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+    "@img/sharp-win32-ia32": ["@img/sharp-win32-ia32@0.35.3", "", { "os": "win32", "cpu": "ia32" }, "sha512-r53mXsBN6lFUDiST764SvgwUdHAqM4rPAiDzAmf4fLoB6X/rkfyTrLCg6+g17wJJiCmB3JYgHuUldCWUIRFSXw=="],
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     "@inquirer/ansi": ["@inquirer/ansi@1.0.2", "", {}, "sha512-S8qNSZiYzFd0wAcyG5AXCvUHC5Sr7xpZ9wZ2py9XR88jUz8wooStVx5M6dRzczbBWjic9NP7+rY0Xi7qqK/aMQ=="],
 
@@ -741,25 +745,25 @@
 
     "@napi-rs/wasm-runtime": ["@napi-rs/wasm-runtime@1.1.6", "", { "dependencies": { "@tybys/wasm-util": "^0.10.3" }, "peerDependencies": { "@emnapi/core": "^1.7.1", "@emnapi/runtime": "^1.7.1" } }, "sha512-ZLv/JdUfkvOy9eCnnBaGfiO+XimbjebAeO+MRQqD/B+FR1tnRN0tpKSJHRbE8sFfS6aqsXZ67TQjfwfsxULVbg=="],
 
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+    "@next/bundle-analyzer": ["@next/bundle-analyzer@16.3.0-preview.10", "", { "dependencies": { "webpack-bundle-analyzer": "4.10.1" } }, "sha512-9x7sNN+MLcz5ETF7UDfE3BV658wzNNMer/ZRshfI7xMBkbGYewiFG/0zaDzZQRWFJ7/lrr08tFm/rK39TqKGjA=="],
 
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+    "@next/env": ["@next/env@16.3.0-preview.10", "", {}, "sha512-R4uP3RswLWJnbsGqbtoHnE5cZY+2VR7KDMyp/UMvBX/SFRNF/YxTs0Dikr+fL4zhyrFKoejn5Iv+24vzZrNn6g=="],
 
-    "@next/swc-darwin-arm64": ["@next/swc-darwin-arm64@16.2.12", "", { "os": "darwin", "cpu": "arm64" }, "sha512-0W1R0teHWJrqKX0FH20IzzIWAOuGtBxPGuObrxy1lE8hQvCFj49KE8a3WUg0D7sq6rn6zkM4c7YGUnhudBS6oA=="],
+    "@next/swc-darwin-arm64": ["@next/swc-darwin-arm64@16.3.0-preview.10", "", { "os": "darwin", "cpu": "arm64" }, "sha512-Jslk3Uf38yPaN7HOw89ewSHmeWb58uRxlqtguXoq4hWrAQl6mtGIeRNvZpOMOQg7/KCf8VOO+LYj9Elulnui5g=="],
 
-    "@next/swc-darwin-x64": ["@next/swc-darwin-x64@16.2.12", "", { "os": "darwin", "cpu": "x64" }, "sha512-Hy5Ls099+aFUmOLmIgPfLqNi6iCwhL3uQCssz5rWk+5Nkc6TUKCE83DY5BbNylfm3+mfwcSFnLRfrZDJhVxdtw=="],
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-    "@next/swc-linux-arm64-musl": ["@next/swc-linux-arm64-musl@16.2.12", "", { "os": "linux", "cpu": "arm64" }, "sha512-0qjhiYBaKAqF63LA1ZWAAnKTzFUguAaZiRa5etMLGGPj/B6uEVjtIZldIzFEp3wHlB0koK6aTzqPtSdplTCjoA=="],
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+    "@next/swc-linux-x64-musl": ["@next/swc-linux-x64-musl@16.3.0-preview.10", "", { "os": "linux", "cpu": "x64" }, "sha512-p8AVApwWPAmVS0gzk119ZxqZUB6Jc6uQ/USbWzJNOBSmG9PWSg+SS+rQPG+zHi8lWyFO++VwiLghG7jI/VjIbw=="],
 
-    "@next/swc-win32-arm64-msvc": ["@next/swc-win32-arm64-msvc@16.2.12", "", { "os": "win32", "cpu": "arm64" }, "sha512-X6hzsOUJac/e7AWSbn9gQ9nzHld1xWP5iyjHpYWvud8pufB679O1xg4JDyKr8Xd69Jvd+kM2Der6uftiZCmjYA=="],
+    "@next/swc-win32-arm64-msvc": ["@next/swc-win32-arm64-msvc@16.3.0-preview.10", "", { "os": "win32", "cpu": "arm64" }, "sha512-khUIO/lttNa7qyuQVDic2rP4IF3Wx9tOsoQlXzcpAfmHmlRZxtbtNfG6RbUcWV1GngbffTXMTvwTMAHmuqkY5w=="],
 
-    "@next/swc-win32-x64-msvc": ["@next/swc-win32-x64-msvc@16.2.12", "", { "os": "win32", "cpu": "x64" }, "sha512-F6fakeHuFTLOPt0bslQJdf+xtT+WIP9DVn/m4y1w1mRnVPyh3D/cNvzlRkxM444xfm+IvvYNSOrKiA2CDJ0Uxw=="],
+    "@next/swc-win32-x64-msvc": ["@next/swc-win32-x64-msvc@16.3.0-preview.10", "", { "os": "win32", "cpu": "x64" }, "sha512-oYKDXWAhMii9inJEUfPUm6v23My8HEaYqY8YQfOArqvTLz4gzt0w3yqKcrzxiWu7tHvBMIqZduD9j/hVdLfqkw=="],
 
     "@noble/ed25519": ["@noble/ed25519@3.1.0", "", {}, "sha512-pfcObRY3CtvwfaG9Mt5XqZdKmAQppl37tHUeuBhDUbiwJBCVY4/A4lbMvb1xKhMDx96AqAqZpMWuBX1HulhX4g=="],
 
@@ -2331,7 +2335,7 @@
 
     "natural-compare": ["natural-compare@1.4.0", "", {}, "sha512-OWND8ei3VtNC9h7V60qff3SVobHr996CTwgxubgyQYEpg290h9J0buyECNNJexkFm5sOajh5G116RYA1c8ZMSw=="],
 
-    "next": ["next@16.2.12", "", { "dependencies": { "@next/env": "16.2.12", "@swc/helpers": "0.5.15", "baseline-browser-mapping": "^2.9.19", "caniuse-lite": "^1.0.30001579", "postcss": "8.4.31", "styled-jsx": "5.1.6" }, "optionalDependencies": { "@next/swc-darwin-arm64": "16.2.12", "@next/swc-darwin-x64": "16.2.12", "@next/swc-linux-arm64-gnu": "16.2.12", "@next/swc-linux-arm64-musl": "16.2.12", "@next/swc-linux-x64-gnu": "16.2.12", "@next/swc-linux-x64-musl": "16.2.12", "@next/swc-win32-arm64-msvc": "16.2.12", "@next/swc-win32-x64-msvc": "16.2.12", "sharp": "^0.34.5" }, "peerDependencies": { "@opentelemetry/api": "^1.1.0", "@playwright/test": "^1.51.1", "babel-plugin-react-compiler": "*", "react": "^18.2.0 || 19.0.0-rc-de68d2f4-20241204 || ^19.0.0", "react-dom": "^18.2.0 || 19.0.0-rc-de68d2f4-20241204 || ^19.0.0", "sass": "^1.3.0" }, "optionalPeers": ["@opentelemetry/api", "@playwright/test", "babel-plugin-react-compiler", "sass"], "bin": { "next": "dist/bin/next" } }, "sha512-iD59eYQWmbFcEbX7v/acG5DRym9iw1DdaPoD0WTA920naWsE25wShzJW4+UvAs8MK9EC2kBfIH6vtto1H1PHGw=="],
+    "next": ["next@16.3.0-preview.10", "", { "dependencies": { "@next/env": "16.3.0-preview.10", "@swc/helpers": "0.5.15", "baseline-browser-mapping": "^2.9.19", "caniuse-lite": "^1.0.30001579", "postcss": "8.5.10", "styled-jsx": "5.1.6" }, "optionalDependencies": { "@next/swc-darwin-arm64": "16.3.0-preview.10", "@next/swc-darwin-x64": "16.3.0-preview.10", "@next/swc-linux-arm64-gnu": "16.3.0-preview.10", "@next/swc-linux-arm64-musl": "16.3.0-preview.10", "@next/swc-linux-x64-gnu": "16.3.0-preview.10", "@next/swc-linux-x64-musl": "16.3.0-preview.10", "@next/swc-win32-arm64-msvc": "16.3.0-preview.10", "@next/swc-win32-x64-msvc": "16.3.0-preview.10", "sharp": "^0.35.3" }, "peerDependencies": { "@opentelemetry/api": "^1.1.0", "@playwright/test": "^1.51.1", "babel-plugin-react-compiler": "*", "react": "^18.2.0 || 19.0.0-rc-de68d2f4-20241204 || ^19.0.0", "react-dom": "^18.2.0 || 19.0.0-rc-de68d2f4-20241204 || ^19.0.0", "sass": "^1.3.0" }, "optionalPeers": ["@opentelemetry/api", "@playwright/test", "babel-plugin-react-compiler", "sass"], "bin": { "next": "dist/bin/next" } }, "sha512-eObeUsXGUpcUgIjK3rCKnD+3xF8kbR13bznbzyqJLlWGdbqQuLYt6DYks3n5pdYYrNFA2qgjoisItDzaRHKJQQ=="],
 
     "next-sanity": ["next-sanity@13.2.3", "", { "dependencies": { "@portabletext/react": "^7.0.1", "@sanity/client": "^7.25.0", "@sanity/generate-help-url": "^4.0.0", "@sanity/preview-url-secret": "^4.1.2", "@sanity/visual-editing": "^5.7.3", "@sanity/webhook": "^4.0.4", "groq": "^6.7.0", "history": "^5.3.0" }, "peerDependencies": { "next": "^16.0.0-0", "react": "^19.2.3", "react-dom": "^19.2.3", "sanity": "^5.29.0 || ^6.0.0", "styled-components": "^6.1" } }, "sha512-tvZ4sdCGvq6HVbJ1eqdmVamZ2RmkxZCUImFlE7j4f17hvg7OdBY5PWf5b26BUynvoR6RGyY9oAD9MMei6hAyLA=="],
 
@@ -2673,7 +2677,7 @@
 
     "shallow-equals": ["shallow-equals@1.0.0", "", {}, "sha512-xd/FKcdmfmMbyYCca3QTVEJtqUOGuajNzvAX6nt8dXILwjAIEkfHc4hI8/JMGApAmb7VeULO0Q30NTxnbH/15g=="],
 
-    "sharp": ["sharp@0.34.5", "", { "dependencies": { "@img/colour": "^1.0.0", "detect-libc": "^2.1.2", "semver": "^7.7.3" }, "optionalDependencies": { "@img/sharp-darwin-arm64": "0.34.5", "@img/sharp-darwin-x64": "0.34.5", "@img/sharp-libvips-darwin-arm64": "1.2.4", "@img/sharp-libvips-darwin-x64": "1.2.4", "@img/sharp-libvips-linux-arm": "1.2.4", "@img/sharp-libvips-linux-arm64": "1.2.4", "@img/sharp-libvips-linux-ppc64": "1.2.4", "@img/sharp-libvips-linux-riscv64": "1.2.4", "@img/sharp-libvips-linux-s390x": "1.2.4", "@img/sharp-libvips-linux-x64": "1.2.4", "@img/sharp-libvips-linuxmusl-arm64": "1.2.4", "@img/sharp-libvips-linuxmusl-x64": "1.2.4", "@img/sharp-linux-arm": "0.34.5", "@img/sharp-linux-arm64": "0.34.5", "@img/sharp-linux-ppc64": "0.34.5", "@img/sharp-linux-riscv64": "0.34.5", "@img/sharp-linux-s390x": "0.34.5", "@img/sharp-linux-x64": "0.34.5", "@img/sharp-linuxmusl-arm64": "0.34.5", "@img/sharp-linuxmusl-x64": "0.34.5", "@img/sharp-wasm32": "0.34.5", "@img/sharp-win32-arm64": "0.34.5", "@img/sharp-win32-ia32": "0.34.5", "@img/sharp-win32-x64": "0.34.5" } }, "sha512-Ou9I5Ft9WNcCbXrU9cMgPBcCK8LiwLqcbywW3t4oDV37n1pzpuNLsYiAV8eODnjbtQlSDwZ2cUEeQz4E54Hltg=="],
+    "sharp": ["sharp@0.35.3", "", { "dependencies": { "@img/colour": "^1.1.0", "detect-libc": "^2.1.2", "semver": "^7.8.5" }, "optionalDependencies": { "@img/sharp-darwin-arm64": "0.35.3", "@img/sharp-darwin-x64": "0.35.3", "@img/sharp-freebsd-wasm32": "0.35.3", "@img/sharp-libvips-darwin-arm64": "1.3.2", "@img/sharp-libvips-darwin-x64": "1.3.2", "@img/sharp-libvips-linux-arm": "1.3.2", "@img/sharp-libvips-linux-arm64": "1.3.2", "@img/sharp-libvips-linux-ppc64": "1.3.2", "@img/sharp-libvips-linux-riscv64": "1.3.2", "@img/sharp-libvips-linux-s390x": "1.3.2", "@img/sharp-libvips-linux-x64": "1.3.2", "@img/sharp-libvips-linuxmusl-arm64": "1.3.2", "@img/sharp-libvips-linuxmusl-x64": "1.3.2", "@img/sharp-linux-arm": "0.35.3", "@img/sharp-linux-arm64": "0.35.3", "@img/sharp-linux-ppc64": "0.35.3", "@img/sharp-linux-riscv64": "0.35.3", "@img/sharp-linux-s390x": "0.35.3", "@img/sharp-linux-x64": "0.35.3", "@img/sharp-linuxmusl-arm64": "0.35.3", "@img/sharp-linuxmusl-x64": "0.35.3", "@img/sharp-webcontainers-wasm32": "0.35.3", "@img/sharp-win32-arm64": "0.35.3", "@img/sharp-win32-ia32": "0.35.3", "@img/sharp-win32-x64": "0.35.3" }, "peerDependencies": { "@types/node": "*" }, "optionalPeers": ["@types/node"] }, "sha512-ej0zVHuZGHCiABXcNxeYhpRnPNPAcvbG8RMdBAhDAxLKkCRVSpK3Iyu7qbqw3JMzoj0REeM6f3tJLtVwl0023Q=="],
 
     "shebang-command": ["shebang-command@2.0.0", "", { "dependencies": { "shebang-regex": "^3.0.0" } }, "sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA=="],
 
@@ -3225,7 +3229,7 @@
 
     "micromatch/picomatch": ["picomatch@2.3.2", "", {}, "sha512-V7+vQEJ06Z+c5tSye8S+nHUfI51xoXIXjHQ99cQtKUkQqqO1kO/KCJUfZXuB47h/YBlDhah2H3hdUGXn8ie0oA=="],
 
-    "next/postcss": ["postcss@8.4.31", "", { "dependencies": { "nanoid": "^3.3.6", "picocolors": "^1.0.0", "source-map-js": "^1.0.2" } }, "sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ=="],
+    "next/postcss": ["postcss@8.5.10", "", { "dependencies": { "nanoid": "^3.3.11", "picocolors": "^1.1.1", "source-map-js": "^1.2.1" } }, "sha512-pMMHxBOZKFU6HgAZ4eyGnwXF/EvPGGqUr0MnZ5+99485wwW41kW91A4LOGxSHhgugZmSChL5AlElNdwlNgcnLQ=="],
 
     "npm-run-path/path-key": ["path-key@4.0.0", "", {}, "sha512-haREypq7xkM7ErfgIyA0z+Bj4AGKlMSdlQE2jvJo6huWD1EdkKYV+G/T4nq0YEF2vgTT8kqMFKo1uHn950r4SQ=="],
 
diff --git a/lib/scripts/bench-navigation.ts b/lib/scripts/bench-navigation.ts
new file mode 100644
index 00000000..63ff34ce
--- /dev/null
+++ b/lib/scripts/bench-navigation.ts
@@ -0,0 +1,246 @@
+/**
+ * Client-side navigation benchmark.
+ *
+ * Lighthouse audits a single cold page load, which is the wrong instrument for
+ * Next's instant-navigation work: `partialPrefetching` and `cachedNavigations`
+ * change how fast an ALREADY-LOADED app swaps routes, and a load audit never
+ * navigates. This measures that instead.
+ *
+ * For each run it clicks a real <Link> and records:
+ *
+ *   shell   click -> the target route's heading is on screen. This is the one
+ *           prefetching moves.
+ *   content click -> the target's streamed content is on screen. Server-bound,
+ *           so it should NOT improve — it is the control. Only reported for
+ *           scenarios that actually have something streaming; see below.
+ *
+ * Reports the median plus the full sample, because TBT/TTI-style numbers on a
+ * dev machine are noisy enough that a small-sample median can be moved by one
+ * outlier — the sample is what tells you whether a delta is real.
+ *
+ * Usage:
+ *   bun run build && PORT=3123 bun run start &
+ *   bun run bench:nav                          # demo scenario
+ *   bun run bench:nav --scenario notfound      # works on any build
+ *   bun run bench:nav --runs 10 --url http://localhost:3124
+ *
+ * ---------------------------------------------------------------------------
+ * What it found (7 runs each, 100ms RTT, `demo` scenario, this branch on next
+ * 16.3.0-preview.10), toggling partialPrefetching + cachedNavigations +
+ * varyParams + optimisticRouting together:
+ *
+ *                    flags off              flags on
+ *   shell     110ms  (spread  84-250)   90ms  (spread 78-105)
+ *   content  1420ms                    1915ms
+ *
+ * The shell median moves a little, but the useful part is the spread: an
+ * on-demand shell fetch ranges 84-250ms, a prefetched one 78-105ms. Prefetching
+ * buys predictability more than raw speed.
+ *
+ * The content number is a genuine cost, not noise — it reproduced unthrottled
+ * (+537ms) and at 100ms RTT (+495ms). Splitting shell from data serialises
+ * them: the shell paints from cache, and only then does the dynamic request
+ * start, so this route's 1.5s server sleep begins ~500ms later than it would
+ * in a single streamed response. Whether that trade is right depends on
+ * whether an instant shell plus skeleton beats a shorter blank wait for the
+ * route in question. It is a trade, not a free win.
+ *
+ * The `notfound` scenario, same 7 runs and 100ms RTT, comparing `main` (next
+ * 16.2.12, no instant-nav flags) against this branch (16.3.0-preview.10, all
+ * four on):
+ *
+ *   main    shell 116ms  (spread 83-223)
+ *   branch  shell 107ms  (spread 81-327)
+ *
+ * No signal. 9ms apart with ~40ms of run-to-run variation and one large outlier
+ * on each side. That is the expected result, and it is the useful half of the
+ * comparison: `/` is statically prerendered, so there is no shell-versus-data
+ * split for `partialPrefetching` to make. A static route is equally
+ * prefetchable before and after. The flags target dynamic routes, which is
+ * precisely why `demo` shows a difference and this does not — so do not read
+ * this scenario as evidence the flags do nothing.
+ * ---------------------------------------------------------------------------
+ */
+import { chromium, type Page } from 'playwright-core'
+
+type Scenario = {
+  /** Path to load before clicking. */
+  from: string
+  /** Heading that confirms the starting page is hydrated. */
+  fromHeading: string | RegExp
+  /** Accessible name of the <Link> to click. */
+  linkName: RegExp
+  /** Heading that confirms the target route's shell has painted. */
+  shellHeading: string | RegExp
+  /**
+   * Text that confirms the target's server-bound content arrived. Omit when
+   * the target has nothing streaming — reporting a `content` number for a
+   * fully static route would just be a second, noisier reading of `shell`.
+   */
+  contentText?: RegExp
+  describe: string
+}
+
+const SCENARIOS: Record<string, Scenario> = {
+  /**
+   * The real measurement. Needs `app/instant-nav-demo/**`, which lives only on
+   * the Next 16.3 preview branch — those routes exist specifically to create a
+   * surface where instant navigation is observable.
+   */
+  demo: {
+    from: '/instant-nav-demo',
+    fromHeading: 'Instant Navigations demo',
+    linkName: /slow route/i,
+    shellHeading: 'Slow route',
+    contentText: /Streamed in after/,
+    describe: 'demo hub -> /instant-nav-demo/slow (shell + streamed content)',
+  },
+
+  /**
+   * Fallback that runs against ANY build, including `main`.
+   *
+   * `main` has no client-side navigation surface on its happy path: the only
+   * internal <Link>s are in error.tsx and not-found.tsx, there is no header
+   * nav, and nothing links `/` to `/sanity`. Since prefetching is a <Link>
+   * behaviour, the 404's "Go Home" link is the one real navigation available.
+   *
+   * Read it narrowly. `/` is statically prerendered, so this times a prefetched
+   * STATIC shell and nothing else. It cannot show the shell-vs-data
+   * serialisation trade the `demo` scenario found, because there is no dynamic
+   * data to serialise — which is exactly why it reports no `content` number.
+   * Useful as a same-scenario A/B across two builds; not comparable to `demo`.
+   */
+  notfound: {
+    from: '/__bench-nonexistent-path',
+    fromHeading: '404',
+    linkName: /go home/i,
+    shellHeading: 'Satūs',
+    describe: '404 -> / via "Go Home" (static shell only, no streamed content)',
+  },
+}
+
+type Sample = { shell: number; content?: number }
+
+const args = process.argv.slice(2)
+function arg(name: string, fallback: string) {
+  const i = args.indexOf(`--${name}`)
+  return i !== -1 && args[i + 1] ? (args[i + 1] as string) : fallback
+}
+
+const BASE = arg('url', 'http://localhost:3123').replace(/\/+$/, '')
+const RUNS = Number(arg('runs', '7'))
+const SCENARIO_NAME = arg('scenario', 'demo')
+
+/**
+ * Round-trip latency to emulate, in ms. This is not optional decoration: on
+ * localhost the RTT is ~0, and hiding round trips is the entire reason
+ * prefetching exists. Measured against an unthrottled local server the flags
+ * look useless — there is no latency for a prefetched shell to save, so the
+ * extra request the split introduces for dynamic content shows up as pure
+ * cost. Throttle, or the number you get is an artifact of the harness.
+ *
+ * `--latency 0` opts out, for when you specifically want the no-network case.
+ */
+const LATENCY = Number(arg('latency', '100'))
+// Rough Fast-3G-ish pipe. Bandwidth matters far less than RTT here, but
+// leaving it uncapped alongside a latency figure would be an odd mix.
+const DOWNLOAD_MBPS = Number(arg('download', '10'))
+const UPLOAD_MBPS = Number(arg('upload', '3'))
+
+const median = (xs: number[]) =>
+  [...xs].sort((a, b) => a - b)[Math.floor(xs.length / 2)] ?? Number.NaN
+
+function heading(page: Page, name: string | RegExp) {
+  return page.getByRole('heading', { name }).first()
+}
+
+async function main() {
+  const scenario = SCENARIOS[SCENARIO_NAME]
+  if (!scenario) {
+    console.error(
+      `Unknown scenario "${SCENARIO_NAME}". Available: ${Object.keys(SCENARIOS).join(', ')}`
+    )
+    process.exit(1)
+  }
+
+  const browser = await chromium.launch({ args: ['--no-sandbox'] })
+  const page = await browser.newPage()
+
+  if (LATENCY > 0) {
+    const cdp = await page.context().newCDPSession(page)
+    await cdp.send('Network.enable')
+    await cdp.send('Network.emulateNetworkConditions', {
+      offline: false,
+      latency: LATENCY,
+      downloadThroughput: (DOWNLOAD_MBPS * 1_000_000) / 8,
+      uploadThroughput: (UPLOAD_MBPS * 1_000_000) / 8,
+    })
+  }
+
+  const samples: Sample[] = []
+
+  for (let i = 0; i < RUNS; i++) {
+    // Full reload each iteration so every run starts from the same place: a
+    // freshly hydrated starting page. Without this, run 2 onward would measure
+    // a warm client cache and read far faster than reality.
+    await page.goto(`${BASE}${scenario.from}`, { waitUntil: 'load' })
+    await heading(page, scenario.fromHeading).waitFor()
+
+    // Let prefetching settle. This is the whole point of the flags — the shell
+    // should already be in the client cache before the click happens.
+    await page.waitForTimeout(1000)
+
+    const started = Date.now()
+    await page.getByRole('link', { name: scenario.linkName }).first().click()
+
+    await heading(page, scenario.shellHeading).waitFor()
+    const shell = Date.now() - started
+
+    if (scenario.contentText) {
+      await page.getByText(scenario.contentText).waitFor({ timeout: 30_000 })
+      samples.push({ shell, content: Date.now() - started })
+    } else {
+      samples.push({ shell })
+    }
+
+    process.stdout.write('.')
+  }
+
+  await browser.close()
+
+  const shells = samples.map((s) => s.shell)
+
+  console.log(`\n\nclient-side navigation: ${scenario.describe}`)
+  console.log(
+    `${BASE} · ${RUNS} runs · ${
+      LATENCY > 0
+        ? `${LATENCY}ms RTT, ${DOWNLOAD_MBPS}/${UPLOAD_MBPS} Mbps`
+        : 'unthrottled (no RTT — prefetching has nothing to hide, see header)'
+    }\n`
+  )
+  console.log(
+    `  shell    median ${median(shells).toFixed(0)}ms   ${JSON.stringify(shells)}`
+  )
+
+  if (scenario.contentText) {
+    const contents = samples.map((s) => s.content ?? Number.NaN)
+    console.log(
+      `  content  median ${median(contents).toFixed(0)}ms   ${JSON.stringify(contents)}`
+    )
+    console.log(
+      `\n  shell is what prefetching moves. content is server-bound and is the` +
+        `\n  control — it should not improve.\n`
+    )
+  } else {
+    console.log(
+      `\n  no content metric: this target has nothing streaming, so the only` +
+        `\n  honest number is the shell. Compare against the same scenario on` +
+        `\n  another build, not against the demo scenario.\n`
+    )
+  }
+}
+
+main().catch((error) => {
+  console.error(error)
+  process.exit(1)
+})
diff --git a/lib/scripts/bench-rerender.ts b/lib/scripts/bench-rerender.ts
index d57317c9..9876b8f1 100644
--- a/lib/scripts/bench-rerender.ts
+++ b/lib/scripts/bench-rerender.ts
@@ -5,11 +5,8 @@
  * other two structurally cannot:
  *
  *   bun run lighthouse   one cold page load. Blind to re-renders entirely.
- *   (bench:nav)          client-side route swaps. Lives on the Next 16.3
- *                        preview branch, because its useful scenario needs the
- *                        instant-nav demo routes, which are branch-only.
- *                        Measures navigation, not the work a mounted tree does
- *                        when state changes.
+ *   bun run bench:nav    client-side route swaps. Measures navigation, not
+ *                        the work a mounted tree does when state changes.
  *   bun run bench:rerender  ← this. Main-thread cost of re-rendering an
  *                             already-mounted tree.
  *
diff --git a/next.config.ts b/next.config.ts
index 3fcfd04e..d1e5879d 100644
--- a/next.config.ts
+++ b/next.config.ts
@@ -93,6 +93,9 @@ const nextConfig: NextConfig = {
         : false,
   },
   cacheComponents: true,
+  // 16.3: shell-based prefetching — the top-level successor to the
+  // experimental.prefetchInlining stepping stone; requires cacheComponents: true.
+  partialPrefetching: true,
   compress: true,
   logging: {
     fetches: {
@@ -103,8 +106,28 @@ const nextConfig: NextConfig = {
   experimental: {
     taint: true,
     cachedNavigations: true,
-    prefetchInlining: true,
+    // The rest of the instant-navigation cluster that `partialPrefetching` and
+    // `cachedNavigations` belong to (they are passed to renderOpts together in
+    // next/dist/esm/server/base-server.js).
+    //
+    // `varyParams` lets Cache Components key a segment on the params it
+    // actually reads, instead of invalidating the whole segment whenever any
+    // param changes. It is the one with the most to gain here, since
+    // `cacheComponents` is already on.
+    varyParams: true,
+    // `optimisticRouting` is the current route-tree match for the client
+    // segment cache. It replaces a deprecated search-params-based path that
+    // Next still ships behind `deprecated_requestOptimisticRouteCacheEntry`.
+    optimisticRouting: true,
+    // 16.3 preview: persistent Turbopack FS cache for `next build` (faster
+    // cached CI/Vercel builds) + the native Rust port of the React Compiler
+    // (pairs with the top-level `reactCompiler: true`). Both experimental.
+    turbopackFileSystemCacheForBuild: true,
+    turbopackRustReactCompiler: true,
     sri: { algorithm: 'sha384' },
+    // Not setting `cssChunking: 'graph'`. Measured on this branch it produced
+    // 11 stylesheets instead of the default's 9, for identical total bytes —
+    // more requests, no saving. The default 'loose' heuristic wins here.
     optimizePackageImports: [
       '@react-three/drei',
       '@react-three/fiber',
diff --git a/package.json b/package.json
index b3c7ac9c..a41ca5ef 100644
--- a/package.json
+++ b/package.json
@@ -27,6 +27,7 @@
     "analyze:experimental": "next experimental-analyze",
     "dev:inspect": "bun ./lib/scripts/dev.ts --inspect",
     "lighthouse": "bunx @unlighthouse/cli --site http://localhost:3000",
+    "bench:nav": "bun ./lib/scripts/bench-navigation.ts",
     "bench:rerender": "bun ./lib/scripts/bench-rerender.ts",
     "setup:project": "bun ./lib/scripts/setup-project.ts",
     "test": "bun test",
@@ -59,7 +60,7 @@
     "gsap": "^3.15.0",
     "hamo": "^1.0.1",
     "lenis": "^1.3.25",
-    "next": "16.2.12",
+    "next": "16.3.0-preview.10",
     "next-sanity": "^13.2.3",
     "postprocessing": "^6.39.4",
     "react": "19.2.8",
@@ -75,7 +76,7 @@
     "@clack/prompts": "^1.7.0",
     "@csstools/postcss-global-data": "^4.0.0",
     "@happy-dom/global-registrator": "^20.11.1",
-    "@next/bundle-analyzer": "16.2.12",
+    "@next/bundle-analyzer": "16.3.0-preview.10",
     "@playwright/test": "1.62.0",
     "@sanity/vision": "^6.7.0",
     "@storybook/addon-mcp": "^0.7.0",