Performance Optimization Guide

Introduction

Performance optimization is crucial for delivering fast, responsive, and scalable web applications. This guide covers techniques for improving load times, reducing resource consumption, and maintaining efficiency across platforms.

Why Optimize?

🚀 Improved user retention and satisfaction
⚡ 40% of users abandon pages taking more than 3 seconds to load
🌍 Optimized assets for global accessibility

Key Goals

Minimize latency and idle time
Reduce CPU/GPU memory usage
Improve Time to Interactive (TTI)
Enable progressive enhancements for all devices

Optimization Techniques

Code Optimization

Use Tree Shaking to remove dead code
Minify JavaScript/CSS with Terser/PostCSS
Defer non-critical scripts

Asset Optimization

Compress images resources
Use WebP/AVIF instead of JPEG/PNG
Lazy load offscreen media

Network Optimization

Enable HTTP/3 and QUIC
Use CDN with geo-redundant distribution
Implement caching headers

Optimization Checklist

Eliminate render-blocking resources

Leverage browser caching for static assets

Implement lazy loading for all non-critical elements

Use performance audit tools weekly

Code Examples


// Webpack optimization example
module.exports = {
  mode: 'production',
  optimization: {
    usedExports: true,
    splitChunks: {
      chunks: 'all',
      minSize: 20000,
      maxSize: 70000,
      minChunks: 1,
      maxAsyncRequests: 5,
      maxInitialRequests: 3,
    },
    runtimeChunk: 'single',
  },
  devtool: 'source-map',
  cache: {
    type: 'filesystem',
    buildDependencies: {
      config: [__filename],
    },
  },
};

Performance Optimization