🔄 Angular Lazy Loading Tutorial

Lazy loading is a powerful technique to optimize Angular applications by loading feature modules on demand instead of initial load. This improves performance and reduces bundle size. Let's dive into the essentials!

---

🧠 What is Lazy Loading?

Lazy loading defers the loading of non-critical parts of an app until they're needed.
In Angular, this is achieved using the loadChildren property in routing configurations.
🚀 Key benefits:

• Smaller initial payload
• Faster initial load time
• Better user experience
• Modular code structure

---

🛠 How to Implement Lazy Loading

1. Create feature modules
   Use ng generate module for dedicated feature modules (e.g., auth.module)

2. Configure lazy loading in app-routing.module.ts

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

3. Use RouterModule.forRoot for root routes

   const appRoutes: Routes = [
     { path: '', loadChildren: () => import('./main/main.module').then(m => m.MainModule) },
     { path: 'lazy', loadChildren: () => import('./lazy/lazy.module').then(m => m.LazyModule) }
   ];
   

---

📌 Best Practices

• 📌 Use NgModule for grouping related components
• 📌 Avoid lazy loading critical features (e.g., navigation menus)
• 📌 Combine with PreloadStrategy for optimal performance
• 📌 Test with Angular CLI's --prod flag for production builds

---

📚 Related Reading

For deeper insights into Angular modules and performance optimization:
Angular Modules Guide

---

*Figure: Angular lazy loading architecture*