Improving Webpack Build Speed: Applying Esbuild-Loader Reduces Production Build Time by Approximately 2.5x

This is a case study on improving build speed by replacing Webpack's Babel-Loader with Esbuild-Loader. Local environment measurements showed that Dev Server startup time decreased from an average of 3399.80ms to 2031.40ms, and Hot Module Replacement (HMR) time decreased from an average of 199.20ms to 102.00ms. In particular, for production builds, using Babel-Loader and Terser Minify took an average of 5617.40ms, but applying Esbuild-Loader and Esbuild Minify reduced this to an average of 2238.20ms, making it approximately 2.5x faster. Esbuild is fast because it is written in the Go language, which is compiled into machine code before execution, and unlike JavaScript's single-threaded nature, it can process multiple files simultaneously using multiple threads. Significant time savings can be achieved by replacing only the loader while maintaining the existing Webpack configuration.