JavaScript is one of the biggest culprits behind slow Magento 2 storefronts. A default installation can easily generate 100+ individual JS file requests per page. Each one adds latency, blocks rendering, and hammers your Time to First Byte (TTFB). In this guide, we'll walk through Magento's built-in bundling system, how RequireJS works under the hood, and the concrete steps you can take to dramatically reduce JS overhead. Why Magento 2 JS is Slow by Default Magento 2 uses RequireJS (AMD module format) to load JavaScript dependencies on demand. This is a flexible system, but it comes with a significant downside in production: the browser has to make a waterfall of individual HTTP requests to resolve the dependency graph at runtime. On a typical category page you'll see: requirejs/require.js requirejs-config.js Dozens of individual *.js modules loaded on demand Even with HTTP/2 multiplexing, this many round trips add up — especially on mobile or high-latency connections.…