How to Implement Lazy Loading in Angular for Optimised Apps

If your Angular app is loading everything at once, you're not just wasting bandwidth—you’re losing users.

Every extra second your app takes to load, your bounce rate goes up. So, what if you could load only what the user needs, exactly when they need it? That’s where Lazy Loading comes in.

In this post, let’s walk through how to implement Lazy Loading in Angular to build highly optimized apps with better performance and lower initial load times. 🚀

🤔 What is Lazy Loading in Angular?

Lazy loading is a design pattern in Angular that delays loading feature modules until they are needed. Instead of downloading the entire app at once, Angular loads modules on demand—keeping initial loads lean and fast.

Imagine you have a dashboard, settings panel, and an admin panel. Why load all of them upfront when the user might never visit the admin panel?

🧠 Why Should You Care?

• 🔥 Faster load time = better user experience
• 📱 Optimized performance, especially on mobile
• 📉 Reduced bundle size
• 📈 Improved SEO and Core Web Vitals

🛠️ Step-by-Step: Implementing Lazy Loading in Angular

Let’s break it down with a real-world example.

1. Generate a Feature Module with Routing

ng generate module feature --route feature --module app

This command:

• Creates a module feature
• Adds lazy-loaded route to the AppRoutingModule

Your app-routing.module.ts will now include something like:

const routes: Routes = [
  {
    path: 'feature',
    loadChildren: () =>
      import('./feature/feature.module').then(m => m.FeatureModule)
  }
];

🔗 Learn more about Angular CLI commands

2. Setup Feature Module

In feature.module.ts:

@NgModule({
  declarations: [FeatureComponent],
  imports: [
    CommonModule,
    RouterModule.forChild([
      { path: '', component: FeatureComponent }
    ])
  ]
})
export class FeatureModule {}

Ensure you’ve created the FeatureComponent as well.

ng generate component feature/feature

3. Keep App Module Clean

Don't import FeatureModule into AppModule. That's the point—Angular will load it only when needed.

🧪 Bonus Tips to Optimize Lazy Loading Even More

• ✅ Preloading Strategy: Load modules in the background after app loads.

  imports: [
    RouterModule.forRoot(routes, { preloadingStrategy: PreloadAllModules })
  ]

🔗 Angular Docs on Preloading Strategies

• ✅ Use canLoad guards to control module access and avoid unnecessary network requests.

• ✅ Split modules wisely: Group related components/features in the same lazy module.

🎁 Recommended Reads & Tools

• Official Angular Lazy Loading Guide
• Webpack Bundle Analyzer — helps you visualize bundle size
• Angular Performance Best Practices

💬 Let's Discuss!

Have you tried lazy loading in your Angular app? What kind of performance improvements did you see? Share your experience or drop your questions below! ⬇️

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