Lazy Loading Modules

Lazy loading improves performance by loading modules only when they're needed. Let's explore this important Angular feature.

What is Lazy Loading?

Lazy loading is loading modules asynchronously when a user navigates to a particular route, instead of loading all modules at app startup.

Why Use Lazy Loading?

• Reduces initial loading time
• Improves performance
• Optimizes resource usage

Creating a Lazy Loaded Module

Create a feature module to lazy load with Angular CLI:

ng generate module admin --route admin --module app.module

Configuring Lazy Routes

Set up lazy loading in your routing module:

{ path: 'admin', loadChildren: () => import('./admin/admin.module').then(m => m.AdminModule) }

Testing Lazy Loading

Use developer tools to confirm modules load only when routes are activated. You’ll see new JS files being loaded dynamically.

Preloading Strategies

Angular allows preloading of lazy-loaded modules to improve navigation speed further. Common strategies are:

• No preloading (default)
• Preload all modules

Lazy Loading Best Practices

Use lazy loading for modules not required immediately on application startup, like admin dashboards or settings pages.

Summary

You've successfully learned how to implement lazy loading to enhance your Angular application's performance. Great job!