I am experiencing slow load times for my Angular 2 app when first-time users access it, and I am seeking assistance in optimizing its speed

Below, you'll find a snippet from my app.ts file.

I'm currently working with angular2, firebase, and typescript.

I'm curious if the sluggish performance is due to the abundance of routes and injected files?

The application functions smoothly for returning users, but first-time visitors to the homepage seem to experience this issue.

I'm uncertain whether tweaking the bootstrap at the bottom could enhance the speed or if there's an error in my setup.

This snippet showcases my app.ts file:


        // App imports and initial settings omitted for brevity.
        
        @Component({
            selector: 'app',
            template: `
                <!-- Templates and logic details removed for conciseness. -->
            `,
            directives: [ /* List of component directives removed for clarity. */ ]
        })
        
        @RouteConfig([
            // Route configurations skipped for succinctness.
        ])
        
        @Injectable()
        
        export class AppComponent {
            // Main app component logic excluded here for simplification.
        }
        
        bootstrap(AppComponent, [ /* Bootstrap configuration parameters eliminated for readability. */ ]);
    

Answer №1

If you want to optimize your code for production, you should consider packaging it.

This involves transpiling all files into JavaScript and combining them similar to how Angular2 does. By bundling multiple modules into a single JS file, you can reduce the number of HTTP requests required to load your application in the browser.

However, keep in mind that the SystemJS configuration provided below may result in one call per module, which is more suitable for development than production:

<script>
  System.config({
    packages: {        
      app: {
        format: 'register',
        defaultExtension: 'js'
      }
    }
  });
  System.import('app/boot')
        .then(null, console.error.bind(console));
</script>

For a better understanding of module resolution, you can refer to the following link:

  • How does Angular2 resolve imports?

To achieve this packaging process, Gulp and its relevant plugins can be utilized:

Additional resources on using Gulp for concatenation and minification:

Answer №2

For those arriving here now, even though it's late...if you're working with angular2+, consider using

ng build --prod --env=<staging or prod or your env file>

This command performs Ahead-of-Time compilation, bundling, cache busting, and minification all at once. For more information, visit the Angular official website in the ng build section. In my experience, one of the chunk was initially 2.4MB, but after optimizations, it was reduced to 450+KB. With the inclusion of --prod, it further decreased to 200+KB.

The ideal size for an app varies. Angular2 includes features like lazy loading or chunking. By dividing your app into chunks (such as admin UI and user UI) and loading them only when needed, you can minimize the initial load time. Additional resources that may be helpful:

Answer №3

Encountered a similar issue myself, the solution is to run the webpack build in production mode.

To accomplish this, first install webpack globally by using the command npm install webpack -g. After installation, execute webpack -p from your application's main directory. This reduced my file size significantly, from over 5MB to approximately 700KB.

Answer №4

It appears that the issue you are encountering may be attributed to the large file size being delivered to the client. A 6.9MB file is significant in terms of network bandwidth and processing time.

Recommendations:

  1. Optimize your application by minifying it
  2. Consider breaking it down into smaller bundles (such as vendors.js, core.js, etc.)

Answer №5

To potentially enhance the performance of your application, consider implementing Lazy Loading

This method can help reduce unnecessary imports in your appModule and allow modules to be loaded only when needed.

Answer №6

A significant problem arises with zone.js and polyfills, causing a noticeable slowdown in the application.

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