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Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.


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A webpack plugin to run uglifyjs in parallel.




webpack-parallel-uglify-plugin Build status Coverage Status

This plugin serves to help projects with many entry points speed up their builds. The UglifyJS plugin provided with webpack runs sequentially on each of the output files. This plugin runs uglify in parallel with one thread for each of your available cpus. This can lead to significantly reduced build times as minification is very CPU intensive.


Configuring is straightforward.

import ParallelUglifyPlugin from 'webpack-parallel-uglify-plugin';

module.exports = {
  plugins: [
    new ParallelUglifyPlugin({
      // Optional regex, or array of regex to match file against. Only matching files get minified.
      // Defaults to /.js$/, any file ending in .js.
      include, // Optional regex, or array of regex to include in minification. Only matching files get minified.
      exclude, // Optional regex, or array of regex to exclude from minification. Matching files are not minified.
      cacheDir, // Optional absolute path to use as a cache. If not provided, caching will not be used.
      workerCount, // Optional int. Number of workers to run uglify. Defaults to num of cpus - 1 or asset count (whichever is smaller)
      sourceMap, // Optional Boolean. This slows down the compilation. Defaults to false.
      uglifyJS: {
        // These pass straight through to uglify-js@3.
        // Cannot be used with terser.
        // Defaults to {} if not neither uglifyJS or terser are provided.
        // You should use this option if you need to ensure es5 support. uglify-js will produce an
        // error message if it comes across any es6 code that it can't parse.
      terser: {
        // These pass straight through to terser.
        // Cannot be used with uglifyJS.
        // terser is a fork of uglify-es, a version of uglify that supports ES6+ version of uglify
        // that understands newer es6 syntax. You should use this option if the files that you're
        // minifying do not need to run in older browsers/versions of node.

Example Timings

These times were found by running webpack on a very large build, producing 493 output files and totaling 144.24 MiB before minifying. All times are listed with fully cached babel-loader for consistency.

Note: I no longer have access to the huge project that I was testing this on.

No minification: Webpack build complete in: 86890ms (1m 26s)
Built in uglify plugin: Webpack build complete in: 2543548ms (42m 23s)
With parallel plugin: Webpack build complete in: 208671ms (3m 28s)
With parallel/cache: Webpack build complete in: 98524ms (1m 38s)