Performance Tuning for Angular

Introduction

Performance tuning in Angular refers to the process of optimizing an Angular application to improve its speed and responsiveness. This includes various strategies and techniques that help minimize load times, reduce memory usage, and enhance user experience.

Key Concepts

• Change Detection: Understanding how Angular's change detection mechanism works is crucial for performance tuning.
• Lazy Loading: Load modules only when needed to reduce initial load time.
• Track By: Use the `trackBy` option in ngFor to improve performance when rendering lists.
• OnPush Change Detection: Utilize OnPush strategy to reduce the number of checks done by Angular.

Best Practices

1. Use Lazy Loading for feature modules.
2. Implement OnPush Change Detection strategy where applicable.
3. Optimize Event Binding to minimize change detection cycles.
4. Avoid using ngIf and ngFor in the same template where possible.
5. Limit the use of two-way data binding with [(ngModel)] for better performance.

Code Examples

        // Example of Lazy Loading in Angular
        const routes: Routes = [
            { path: '', component: HomeComponent },
            { path: 'feature', loadChildren: () => import('./feature/feature.module').then(m => m.FeatureModule) }
        ];
        

        // Example of OnPush Change Detection
        import { Component, ChangeDetectionStrategy } from '@angular/core';

        @Component({
            selector: 'app-example',
            templateUrl: './example.component.html',
            changeDetection: ChangeDetectionStrategy.OnPush
        })
        export class ExampleComponent {
            // Component logic
        }
        

Flowchart

    graph TD;
        A[Start] --> B{Is User Interaction Detected?};
        B -- Yes --> C[Update Model];
        B -- No --> D[Render View];
        C --> D;
        D --> E[Check for Changes];
        E --> F{Changes Detected?};
        F -- Yes --> G[Re-render View];
        F -- No --> H[End];
    

FAQ