diff --git a/tests/renderer/viteConfig.test.ts b/tests/renderer/viteConfig.test.ts
new file mode 100644
index 0000000..f3d9d56
--- /dev/null
+++ b/tests/renderer/viteConfig.test.ts
@@ -0,0 +1,25 @@
+// @vitest-environment node
+
+import { describe, expect, it } from 'vitest';
+import viteConfig from '../../vite.config';
+
+describe('vite renderer chunking', () => {
+  it('splits monaco editor modules into a dedicated chunk', () => {
+    const resolved = typeof viteConfig === 'function' ? viteConfig({ command: 'build', mode: 'production', isSsrBuild: false, isPreview: false }) : viteConfig;
+    const output = resolved.build?.rollupOptions?.output;
+
+    if (Array.isArray(output)) {
+      throw new Error('Expected a single rollup output config for renderer build');
+    }
+
+    expect(output?.manualChunks).toBeTypeOf('function');
+
+    const chunkName = output?.manualChunks?.('node_modules/monaco-editor/esm/vs/editor/editor.api.js');
+    expect(chunkName).toBe('monaco-vendor');
+  });
+
+  it('sets an explicit chunk size warning limit for Monaco worker assets', () => {
+    const resolved = typeof viteConfig === 'function' ? viteConfig({ command: 'build', mode: 'production', isSsrBuild: false, isPreview: false }) : viteConfig;
+    expect(resolved.build?.chunkSizeWarningLimit).toBe(8000);
+  });
+});
diff --git a/vite.config.ts b/vite.config.ts
index ad6d04d..3d396d2 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -9,8 +9,28 @@ export default defineConfig({
   build: {
     outDir: '../../dist/renderer',
     emptyOutDir: true,
+    chunkSizeWarningLimit: 8000,
     rollupOptions: {
       input: resolve(__dirname, 'src/renderer/index.html'),
+      output: {
+        manualChunks(id) {
+          if (id.includes('node_modules/monaco-editor') || id.includes('node_modules/@monaco-editor')) {
+            return 'monaco-vendor';
+          }
+
+          if (id.includes('node_modules/@milkdown') || id.includes('node_modules/prosemirror')) {
+            return 'editor-vendor';
+          }
+
+          if (id.includes('node_modules/react') || id.includes('node_modules/scheduler')) {
+            return 'react-vendor';
+          }
+
+          if (id.includes('node_modules/zustand') || id.includes('node_modules/date-fns')) {
+            return 'app-vendor';
+          }
+        },
+      },
     },
   },
   resolve: {