Advanced PWA Performance Topic 17

Table of Contents

1. Introduction

Progressive Web Apps (PWAs) are designed to provide a high-quality user experience. This lesson covers advanced techniques for optimizing the performance of PWAs.

2. Performance Metrics

Understanding performance metrics is crucial for evaluating and improving PWA performance. Key metrics include:

• First Contentful Paint (FCP)
• Time to Interactive (TTI)
• Speed Index
• Largest Contentful Paint (LCP)
• Cumulative Layout Shift (CLS)

3. Optimization Techniques

To improve PWA performance, consider the following optimization techniques:

1. Minimize JavaScript and CSS payloads.
2. Use lazy loading for images and resources.
3. Optimize rendering by using CSS containment.
4. Enable HTTP/2 for better resource loading.
5. Implement service workers for offline capabilities.

4. Caching Strategies

Effective caching strategies can significantly enhance PWA performance. Use the following techniques:

const cacheName = 'v1';
const cacheAssets = ['index.html', 'main.js', 'style.css'];

self.addEventListener('install', (event) => {
    event.waitUntil(
        caches.open(cacheName)
        .then((cache) => {
            return cache.addAll(cacheAssets);
        })
    );
});

5. FAQ