webpack & UglifyJS w/ cache & parallel

package-lock.json

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package.json

     "js-md5": "0.6.1",
     "jssha": "2.2.0",
     "jwt-decode": "2.2.0",
-    "lib-jitsi-meet": "github:jitsi/lib-jitsi-meet#365bd886ee9de81f5d9bd731a57e3b75ab0e766f",
+    "lib-jitsi-meet": "github:jitsi/lib-jitsi-meet#079c50cec6016b7e16b7b6ab4861b4445edfbeba",
     "lodash": "4.17.4",
     "nuclear-js": "1.4.0",
     "postis": "2.2.0",
     "precommit-hook": "3.0.0",
     "string-replace-loader": "1.3.0",
     "style-loader": "0.19.0",
+    "uglifyjs-webpack-plugin": "1.1.1",
     "webpack": "3.8.1",
     "webpack-dev-server": "2.9.4"
   },

webpack.config.js

 /* global __dirname */
 
 const process = require('process');
+const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
 const webpack = require('webpack');
 
 const auiCSS = `${__dirname}/node_modules/@atlassian/aui/dist/aui/css/`;
         }
     }));
     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
     }));
 }