Do you want to fix performance bottlenecks in your JavaScript code to help your website function better? With this book, you'll examine the typical code problems that cause JavaScript to run slow. Most browsers run JavaScript interpreters that don't optimize the original source code, so the structure of your code greatly affects the speed with which it executes. With "High Performance JavaScript", you'll learn how to identify inefficient structures and patterns, and replace them with better-performing alternatives. Understand why JavaScript is slow in general. Identify specific performance bottlenecks and understand what makes them slow. Learn about tools that measure JavaScript performance. Ensure that your scripts will never freeze the browser.