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Handling Large Arrays of Objects in Angular: Memory implementing ngFor

👀 Views: 0 đŸ’Ŧ Answers: 1 📅 Created: 2025-06-12
angular performance ngfor typescript

I tried several approaches but none seem to work. Quick question that's been bugging me - I tried several approaches but none seem to work... I'm working on an Angular application (version 12) that pulls in a large dataset of user objects (around 10,000 records) from an API. When I try to render this data using `*ngFor`, the application becomes extremely sluggish and, in some cases, crashes the browser due to high memory consumption. I've tried using `trackBy` to help Angular optimize the rendering process, but I'm still working with issues, especially when users attempt to scroll through the list. Here's a simplified version of my component: ```typescript import { Component, OnInit } from '@angular/core'; import { HttpClient } from '@angular/common/http'; interface User { id: number; name: string; email: string; } @Component({ selector: 'app-user-list', template: ` <ul> <li *ngFor="let user of users; trackBy: trackByUserId">{{ user.name }} - {{ user.email }}</li> </ul> `, }) export class UserListComponent implements OnInit { users: User[] = []; constructor(private http: HttpClient) {} ngOnInit() { this.http.get<User[]>('https://api.example.com/users') .subscribe(data => this.users = data); } trackByUserId(index: number, user: User): number { return user.id; } } ``` I've also attempted to paginate the data on the server side, but that hasn't been fully implemented yet since I need to show all users at once for our current use case. The current implementation throws a "Memory limit exceeded" behavior in Chrome's DevTools when trying to render the list. Is there a more efficient way to handle large arrays in Angular? Any suggestions on optimization techniques or best practices would be greatly appreciated. For context: I'm using Typescript on Ubuntu. What am I doing wrong? My development environment is Linux. What am I doing wrong?