Advanced PWA Performance Topic 20: Best Practices

1. Introduction

Progressive Web Apps (PWAs) are designed to deliver a reliable, fast, and engaging user experience. This lesson will cover advanced performance best practices to ensure optimal PWA performance.

2. Key Concepts

• **Service Workers**: Scripts that run in the background, enabling features like offline capabilities and caching.
• **Caching Strategies**: Techniques to store resources efficiently to minimize network requests.
• **Performance Metrics**: Tools and metrics to measure the performance of your PWA (e.g., Lighthouse, Web Vitals).

3. Performance Metrics

To optimize PWA performance, understanding key metrics is essential:

• **First Contentful Paint (FCP)**: Time taken to render the first visible element.
• **Largest Contentful Paint (LCP)**: Measures when the largest content element is rendered.
• **Time to Interactive (TTI)**: Time taken for the page to become fully interactive.

4. Best Practices

Implementing these best practices will significantly enhance your PWA's performance:

self.addEventListener('install', (event) => {
    event.waitUntil(
        caches.open('my-cache').then((cache) => {
            return cache.addAll([
                '/',
                '/index.html',
                '/styles.css',
                '/app.js',
            ]);
        })
    );
});
            

import(/* webpackChunkName: "my-chunk-name" */ './module.js').then(module => {
    // Use module here
});
            

lighthouse('https://your-pwa-url.com', {
    output: 'html',
    logLevel: 'info',
});
            

5. FAQ