diff --git a/docs/release-control/v6/internal/subsystems/deployment-installability.md b/docs/release-control/v6/internal/subsystems/deployment-installability.md
index eddfcaa8a..7c40835be 100644
--- a/docs/release-control/v6/internal/subsystems/deployment-installability.md
+++ b/docs/release-control/v6/internal/subsystems/deployment-installability.md
@@ -978,6 +978,12 @@ upgrade, update, release, or artifact-selection behavior.
    deterministic token authentication after setup, and may use the server setup
    API as a fallback only when the UI wizard fails to complete cleanly under the
    managed hot-dev runtime.
+   The built `index.html` must not modulepreload lazy route chunks: the SRI
+   plugin runs with `preloadDynamicChunks: false` so cold start fetches only the
+   entry and its static vendor imports (route-level code splitting stays
+   effective on slow devices), while dynamic-import integrity remains enforced
+   through the generated import map `integrity` block. Reintroducing whole-app
+   preloading is a governed regression, not a tuning knob.
    Managed browser verification must also restart an existing hot-dev session
    when a verification lock is active or the runtime auth file no longer matches
    the deterministic dev user/hash. `tests/integration/scripts/run-playwright.mjs`
diff --git a/frontend-modern/vite.config.ts b/frontend-modern/vite.config.ts
index 44e1e5ccb..10b73710e 100644
--- a/frontend-modern/vite.config.ts
+++ b/frontend-modern/vite.config.ts
@@ -46,7 +46,11 @@ const proxyOriginOverride = process.env.PULSE_DEV_PROXY_ORIGIN ?? '';
 const srcAlias = path.resolve(__dirname, './src');
 
 export default defineConfig(({ mode }) => ({
-  plugins: [solid(), sri({ algorithm: 'sha384' })],
+  // preloadDynamicChunks would modulepreload every lazy chunk (~3.1MB raw,
+  // the whole app incl. all Settings panels and every locale) at cold start,
+  // defeating route-level code splitting on slow devices. Dynamic-import SRI
+  // is still enforced through the generated import map integrity block.
+  plugins: [solid(), sri({ algorithm: 'sha384', preloadDynamicChunks: false })],
   resolve: {
     alias: {
       '@': srcAlias,