Embracing Deferred Loading in Angular 17: Enhancing Performance and User Experience

Performance optimisation is a crucial component of contemporary web development that guarantees a seamless and responsive user experience. With the release of Angular 17, developers now have new resources at their disposal to enhance the functionality of their apps. Deferred loading is one such method that can greatly improve the effectiveness and loading speed of Angular applications. This post will discuss deferred loading and show you how to use it in Angular 17 to build web applications that load faster and use fewer resources.

Preloading Strategies

To further improve the user experience, Angular 17 includes a variety of preloading techniques in addition to lazy loading. Preloading minimizes the apparent delay when switching between pages by enabling the loading of necessary modules or components in the background. Developers have a variety of preloading methods at their disposal, including PreloadAllModules, NoPreloading, and bespoke preloading strategies made to meet the unique requirements of their application.

Route-Based Lazy Loading

With Angular 17, developers may now load modules or components dynamically based on the route they are currently on. This improves route-based lazy loading. Developers can optimise the speed of their applications and minimise superfluous network requests by implementing lazy-loaded routes in the routing configuration. This ensures that only the essential resources are loaded for each route.

Improved Module Resolution

Module resolution has been improved in Angular 17, which makes it simpler for developers to control module dependencies and maximize resource loading. By guaranteeing that modules are resolved effectively and lowering the overhead related to module loading, the enhanced module resolution algorithm enhances the overall speed of Angular applications.

Understanding Deferred Loading

A method for delaying the loading of specific resources or components until they are actually needed is called delayed loading, or lazy loading. When it comes to web development, this usually means that instead of loading everything at once during the first page load, JavaScript modules, CSS files, or Angular components are loaded only when needed.

Developers can decrease the initial payload of their apps and achieve faster load times and better performance by delaying the loading of non-essential resources. Large-scale Angular apps with plenty of dependencies and components benefit the most from this.

Leveraging Deferred Loading in Angular 17

Angular 17 introduces several features and optimizations to facilitate deferred loading and enhance the performance of Angular applications:

1. Lazy Loading Modules

The modular nature of Angular makes lazy loading a breeze. Modules can be loaded dynamically as the user moves through the application thanks to Angular 17’s simple implementation of lazy loading.

const routes: Routes = [

{ path: ‘lazy’, loadChildren: () => import(‘./lazy/lazy.module’).then(m => m.LazyModule) }


By leveraging the loadChildren property in the routing configuration, developers can specify a function that dynamically imports the module only when it is required. This helps reduce the initial bundle size and improves the overall loading speed of the application.

2. Lazy Loading Components

Angular 17 supports not just lazy loading modules but also individual component loading. As a result, developers can load particular components asynchronously, which improves performance even further by delaying the download of unnecessary user interface elements.


selector: ‘app-lazy-component’,

template: `<p>This component is lazily loaded</p>`


export class LazyComponent {}

Developers may load components selectively on-demand with Angular’s component lazy loading capability, which enhances the responsiveness and effectiveness of apps.

3. Optimized Asset Loading

The asset loading procedure in Angular 17 has been improved to allow for the loading of CSS stylesheets, JavaScript files, and other resources more quickly. This covers optimisations like minimizing network queries, loading resources first, and preloading important assets.

Benefits of Deferred Loading

The adoption of deferred loading in Angular 17 offers several benefits for developers and end-users alike:

  1. Faster Initial Load Times: Angular apps can achieve faster initial load times and enhance user experience by delaying the loading of non-essential resources.

  2. Reduced Bundle Size: Deferred loading helps reduce the size of the initial bundle, resulting in smaller payloads and faster load times, particularly for large-scale applications.

  3. Improved Performance: Angular apps may maximize performance by reducing superfluous overhead and enhancing resource utilization by loading resources and components on-demand.

  4. Enhanced Scalability: Developers can load modules and components dynamically as needed without sacrificing speed thanks to delayed loading, which makes it easier to create modular and scalable application structures.


The efficiency of Angular apps may be greatly enhanced by using deferred loading, and Angular 17 gives developers the features and tools they need to put this powerful strategy into practice. Developers can construct web applications that are faster, more efficient, and offer a better user experience by prioritizing resource loading, optimizing asset loading, and utilizing lazy loading for modules and components.

It is impossible to overestimate the significance of performance optimization as online applications develop and become more complicated. Developers can keep ahead of the curve and make sure that their apps continue to be quick, responsive, and scalable in the face of rising demands and expectations by using deferred loading in Angular 17.

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