As web performance becomes increasingly critical, Angular developers must ensure their applications align with Core Web Vitals—Google’s metrics that measure a website’s speed, responsiveness, and visual stability. Focusing on these metrics helps improve user experience and boost search rankings. This blog highlights the best practices for Angular developers, complete with actionable examples.
Core Web Vitals are a set of performance metrics introduced by Google to measure key aspects of the user experience. These metrics focus on loading performance, interactivity, and visual stability. Let’s break them down:
Lazy loading of modules and assets ensures that only critical resources are loaded initially, improving LCP.
Implementation Example:
const routes: Routes = [
{ path: '', component: HomeComponent },
{ path: 'dashboard', loadChildren: () => import('./dashboard/dashboard.module').then(m => m.DashboardModule) },
];
@NgModule({
imports: [RouterModule.forRoot(routes)],
exports: [RouterModule]
})
export class AppRoutingModule {}<img [src]="imagePath" loading="lazy" alt="Lazy loaded image" />While lazy loading is essential, preloading critical assets ensures smooth transitions.
imports: [
RouterModule.forRoot(routes, { preloadingStrategy: PreloadAllModules })
]Large JavaScript bundles increase load times, negatively impacting LCP.
Best Practices:
ng build --prodUse Web Workers to offload heavy computations from the main thread, reducing input delay.
Implementation Example:
Create a Web Worker for CPU-intensive tasks:
1. Generate a Worker
ng generate web-worker app2. Delegate Heavy Computations
// Inside app.worker.ts
addEventListener('message', ({ data }) => {
const result = performHeavyTask(data);
postMessage(result);
});3. Use the Worker in Your Component
const worker = new Worker(new URL('./app.worker', import.meta.url));
worker.postMessage(data);
worker.onmessage = ({ data }) => {
this.result = data;
};<img [src]="imagePath" [width]="300" [height]="200" alt="Image with defined dimensions" />
<!-- Reserve space for ads or dynamic content -->
<div class="ad-slot" style="width:300px; height:250px;"></div><ngx-skeleton-loader count="1" [theme]="{ width: '100%', height: '200px' }"></ngx-skeleton-loader>Server-side rendering (SSR) improves performance by pre-rendering HTML on the server.
Related read: Angular Performance Boost: Unlocking SSR with Cloud Functions
1. Add Angular Universal
ng add @nguniversal/express-engine
2. Build and Serve Your App
npm run build:ssr && npm run serve:ssr
Example:
Install the Web Vitals library:
npm install web-vitals
Capture metrics in your app:
import { getCLS, getFID, getLCP } from 'web-vitals';
getCLS(console.log);
getFID(console.log);
getLCP(console.log);
Optimizing Angular applications for Core Web Vitals is crucial for delivering a fast and seamless user experience. By implementing lazy loading, using Web Workers, ensuring visual stability, and leveraging server-side rendering, you can significantly enhance your app’s performance.
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