diff --git a/web/vite.config.ts b/web/vite.config.ts
index 9eec5a4..8103157 100644
--- a/web/vite.config.ts
+++ b/web/vite.config.ts
@@ -14,7 +14,10 @@ export default defineConfig({
     paraglideVitePlugin({
       project: './project.inlang',
       outdir: './src/paraglide',
-      outputStructure: 'message-modules',
+      // Paraglide 2's default: one module per locale in the dev server and tests (a few requests),
+      // one per message in production builds (tree shaking). v3 would serve virtual modules only Vite
+      // can resolve.
+      outputStructure: process.env.NODE_ENV === 'production' ? 'message-modules' : 'locale-modules',
       strategy: ['localStorage', 'preferredLanguage', 'baseLocale'],
     }),
     // src/routes/* → src/routeTree.gen.ts; has to run before the React plugin.