Using defer in Angular 17 to implement lazy loading

Introduction

• Using defer in Angular 17 to implement lazy loading helps improve the performance and loading time of the application.
• By splitting up larger applications into smaller components and dynamically loading them, we can deliver only the required parts of the application to the user.
• This approach reduces the initial load time and re-download time when updating the application.

Benefits of Lazy Loading

• Lazy loading only loads and initializes the components that are needed on a specific page, improving the overall performance of the application.
• By splitting the app into smaller pieces, we can reduce the initial load time for the user and minimize the file size.
• Only the updated parts of the application need to be downloaded when updating the app, reducing the re-download time.

Implementation of Lazy Loading

1. Split the Angular application into smaller components at build time.
2. Separate the assets, favicon, and application files.
3. Use deferred views to load the components dynamically at runtime.
4. The deferred components should be loaded only when the user requests them, based on certain criteria such as scrolling, clicking, or hovering over an element.
5. Use the WhenViewportEnters API to load the component when it enters the user's viewport.
6. Customize the loading process by specifying a minimum display time or waiting time before fetching the component.

Example Application: Rate My Ducks

• Create a simple app called "Rate My Ducks" using Angular and Angular Material.
• The app allows users to view duck details, rate ducks, and perform suggested actions with ducks.
• Initially, the app will load the required parts of Angular Material.
• By implementing lazy loading, only the necessary parts of the application will be loaded when the user requests them.

Conclusion

• Implementing lazy loading with defer in Angular 17 helps optimize the application's performance and loading time.
• By splitting the app into smaller components and loading them dynamically, we can reduce the initial load time and improve the user experience.
• Lazy loading efficiently loads only the required parts of the app, reducing the file size and re-download time when updating the application.