webpack & UglifyJS w/ cache & parallel

package-lock.json

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+          "version": "0.4.6",
+          "resolved": "https://registry.npmjs.org/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-0.4.6.tgz",
+          "integrity": "sha1-uVH0q7a9YX5m9j64kUmOORdj4wk=",
+          "dev": true,
+          "requires": {
+            "source-map": "0.5.7",
+            "uglify-js": "2.8.29",
+            "webpack-sources": "1.0.2"
+          }
         }
       }
     },
       "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
       "dev": true
     },
+    "worker-farm": {
+      "version": "1.5.2",
+      "resolved": "https://registry.npmjs.org/worker-farm/-/worker-farm-1.5.2.tgz",
+      "integrity": "sha512-XxiQ9kZN5n6mmnW+mFJ+wXjNNI/Nx4DIdaAKLX1Bn6LYBWlN/zaBhu34DQYPZ1AJobQuu67S2OfDdNSVULvXkQ==",
+      "dev": true,
+      "requires": {
+        "errno": "0.1.4",
+        "xtend": "4.0.1"
+      }
+    },
     "wrap-ansi": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",

package.json

     "karma-webpack": "1.8.1",
     "precommit-hook": "3.0.0",
     "string-replace-loader": "1.3.0",
+    "uglifyjs-webpack-plugin": "1.1.1",
     "webpack": "3.8.1"
   },
   "scripts": {

webpack.config.js

 /* global __dirname */
 
 const process = require('process');
+const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
 const webpack = require('webpack');
 
 const minimize
 
 if (minimize) {
     plugins.push(new webpack.optimize.ModuleConcatenationPlugin());
-    plugins.push(new webpack.optimize.UglifyJsPlugin({
-        compress: {
-            warnings: true
-        },
+    plugins.push(new UglifyJsPlugin({
+        cache: true,
         extractComments: true,
+        parallel: true,
         sourceMap: true
     }));
 }