Optimizing Angular Universal Performance

1. Introduction

Angular Universal allows you to render Angular applications on the server side, improving performance and SEO. However, optimizing the performance of Angular Universal requires specific techniques to ensure that the server-side rendering (SSR) is efficient and provides a fast user experience.

2. Key Concepts

3. Performance Best Practices

1. Enable AOT (Ahead-of-Time) Compilation
2. Use Transfer State for Data Caching
3. Implement Lazy Loading for Modules
4. Optimize Images and Assets
5. Minimize Third-Party Dependencies
6. Use Angular CLI for Production Builds
7. Monitor Performance with Tools like Lighthouse

3.1 Code Example: Implementing Transfer State

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { TransferState, makeStateKey } from '@angular/platform-browser';

const DATA_KEY = makeStateKey('data');

@Injectable({
  providedIn: 'root',
})
export class DataService {
  constructor(private http: HttpClient, private transferState: TransferState) {}

  fetchData() {
    if (this.transferState.hasKey(DATA_KEY)) {
      const data = this.transferState.get(DATA_KEY, null);
      this.transferState.remove(DATA_KEY);
      return of(data);
    } else {
      return this.http.get('https://api.example.com/data').pipe(
        tap(data => this.transferState.set(DATA_KEY, data))
      );
    }
  }
}

4. FAQ