diff --git a/README.md b/README.md
index 45497e3..2bdc70f 100644
--- a/README.md
+++ b/README.md
@@ -376,6 +376,9 @@ pytest tests/ -v
 # Test con coverage
 pytest tests/ --cov=app
 
+# Browser E2E test (cache-first navigation)
+OLLAMA_HOST=http://192.168.254.115:11434 npm run test:e2e
+
 # Hot reload durante sviluppo
 uvicorn main:app --reload
 ```
diff --git a/package.json b/package.json
index 1db5236..963585e 100644
--- a/package.json
+++ b/package.json
@@ -1,13 +1,16 @@
 {
   "name": "llm-monitor",
   "version": "1.0.0",
+  "type": "commonjs",
   "description": "Dashboard per controllare i modelli caricati in Ollama",
   "private": true,
   "scripts": {
     "tailwind:dev": "tailwindcss -i ./app/web/static/css/input.css -o ./app/web/static/css/output.css --watch",
-    "tailwind:build": "tailwindcss -i ./app/web/static/css/input.css -o ./app/web/static/css/output.css"
+    "tailwind:build": "tailwindcss -i ./app/web/static/css/input.css -o ./app/web/static/css/output.css",
+    "test:e2e": "playwright test tests/e2e/cache-navigation.spec.js"
   },
   "devDependencies": {
+    "@playwright/test": "^1.59.1",
     "tailwindcss": "^3.4.0"
   }
 }
diff --git a/playwright.config.js b/playwright.config.js
new file mode 100644
index 0000000..3ea575d
--- /dev/null
+++ b/playwright.config.js
@@ -0,0 +1,22 @@
+const { defineConfig } = require('@playwright/test');
+
+const baseURL = process.env.TARGET_URL || 'http://127.0.0.1:8011';
+
+module.exports = defineConfig({
+  testDir: './tests/e2e',
+  timeout: 45000,
+  fullyParallel: false,
+  retries: 0,
+  reporter: 'list',
+  use: {
+    baseURL,
+    headless: true,
+    serviceWorkers: 'block'
+  },
+  webServer: {
+    command: 'python3 -m uvicorn main:app --host 127.0.0.1 --port 8011',
+    url: baseURL,
+    reuseExistingServer: true,
+    timeout: 30000
+  }
+});
\ No newline at end of file
diff --git a/tests/e2e/cache-navigation.spec.js b/tests/e2e/cache-navigation.spec.js
new file mode 100644
index 0000000..d87afb5
--- /dev/null
+++ b/tests/e2e/cache-navigation.spec.js
@@ -0,0 +1,78 @@
+const { test, expect } = require('@playwright/test');
+
+const OLLAMA_HOST = process.env.OLLAMA_HOST || 'http://192.168.254.115:11434';
+const SERVER_ID = process.env.TEST_SERVER_ID || 'srv_e2e_cache';
+const SERVER_NAME = process.env.TEST_SERVER_NAME || 'E2E Cache Server';
+const QUIET_WINDOW_MS = Number(process.env.QUIET_WINDOW_MS || 1500);
+const CACHE_WAIT_TIMEOUT_MS = Number(process.env.CACHE_WAIT_TIMEOUT_MS || 20000);
+
+test.describe('cache-first server navigation', () => {
+  test.beforeEach(async ({ page }) => {
+    await page.addInitScript(
+      ({ serverId, serverName, host }) => {
+        localStorage.setItem(
+          'llm_monitor_servers',
+          JSON.stringify([
+            {
+              id: serverId,
+              name: serverName,
+              host
+            }
+          ])
+        );
+        localStorage.setItem('llm_monitor_active_server', serverId);
+      },
+      {
+        serverId: SERVER_ID,
+        serverName: SERVER_NAME,
+        host: OLLAMA_HOST
+      }
+    );
+  });
+
+  test('serves cached data when navigating between running and available pages', async ({ context, page }) => {
+    const apiRequests = [];
+
+    context.on('request', (request) => {
+      const url = new URL(request.url());
+      if (url.pathname.startsWith('/api/v1/')) {
+        apiRequests.push(url.pathname + url.search);
+      }
+    });
+
+    const resetApiRequests = () => {
+      apiRequests.length = 0;
+    };
+
+    const waitForQuietWindow = async (label) => {
+      await page.waitForTimeout(QUIET_WINDOW_MS);
+      expect(apiRequests, `${label} should not issue API requests while cache is fresh`).toEqual([]);
+    };
+
+    await page.goto(`/models-running?server=${SERVER_ID}`, { waitUntil: 'domcontentloaded' });
+
+    await page.waitForFunction(
+      (serverId) => {
+        return ['health', 'models', 'running'].every((suffix) => {
+          return Boolean(localStorage.getItem(`llm_monitor_${suffix}_${serverId}`));
+        });
+      },
+      SERVER_ID,
+      { timeout: CACHE_WAIT_TIMEOUT_MS }
+    );
+
+    expect(apiRequests.length).toBeGreaterThan(0);
+
+    resetApiRequests();
+    await page.goto(`/models-available?server=${SERVER_ID}`, { waitUntil: 'domcontentloaded' });
+    await waitForQuietWindow('running -> available');
+
+    resetApiRequests();
+    await page.goto(`/models-running?server=${SERVER_ID}`, { waitUntil: 'domcontentloaded' });
+    await waitForQuietWindow('available -> running');
+
+    resetApiRequests();
+    await page.goto(`/models-available?server=${SERVER_ID}`, { waitUntil: 'domcontentloaded' });
+    await waitForQuietWindow('running -> available again');
+  });
+});