Advanced JavaScript Optimization

2.1. Performance Metrics

Understanding key performance metrics is essential for optimization:

• Load Time
• Time to Interactive (TTI)
• First Contentful Paint (FCP)
• Speed Index
• Time to First Byte (TTFB)

3.1. Minification and Compression

Minifying JavaScript files reduces their size, while compression (e.g., Gzip) decreases the data sent over the network.

npm install terser -g
terser file.js -o file.min.js

3.2. Code Splitting

Code splitting allows loading only the necessary code, improving initial load times.

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

3.3. Debouncing and Throttling

Use these techniques to limit the rate of function execution, optimizing resource usage.

function debounce(func, wait) {
    let timeout;
    return function executedFunction(...args) {
        const later = () => {
            timeout = null;
            func(...args);
        };
        clearTimeout(timeout);
        timeout = setTimeout(later, wait);
    };
};

3.4. Asynchronous Operations

Utilize async and await to manage asynchronous calls efficiently, reducing blocking.

async function fetchData() {
    const response = await fetch('https://api.example.com/data');
    const data = await response.json();
    console.log(data);
}