diff --git a/lib/core/package.json b/lib/core/package.json
index fb44097e774..a3bbb88a4e7 100644
--- a/lib/core/package.json
+++ b/lib/core/package.json
@@ -82,6 +82,7 @@
     "style-loader": "^0.23.1",
     "svg-url-loader": "^2.3.2",
     "url-loader": "^1.1.2",
+    "terser-webpack-plugin": "^1.1.0",
     "webpack": "^4.23.1",
     "webpack-dev-middleware": "^3.4.0",
     "webpack-hot-middleware": "^2.24.3"
diff --git a/lib/core/src/server/preview/iframe-webpack.config.js b/lib/core/src/server/preview/iframe-webpack.config.js
index b1408691f83..56d154b4341 100644
--- a/lib/core/src/server/preview/iframe-webpack.config.js
+++ b/lib/core/src/server/preview/iframe-webpack.config.js
@@ -4,6 +4,7 @@ import Dotenv from 'dotenv-webpack';
 import HtmlWebpackPlugin from 'html-webpack-plugin';
 import CaseSensitivePathsPlugin from 'case-sensitive-paths-webpack-plugin';
 import WatchMissingNodeModulesPlugin from 'react-dev-utils/WatchMissingNodeModulesPlugin';
+import TerserWebpackPlugin from 'terser-webpack-plugin';
 
 import {
   includePaths,
@@ -95,6 +96,16 @@ export default ({
         chunks: 'all',
       },
       runtimeChunk: true,
+      minimizer: [
+        new TerserWebpackPlugin({
+          cache: true,
+          parallel: true,
+          sourceMap: true,
+          terserOptions: {
+            mangle: false,
+          },
+        }),
+      ],
     },
     performance: {
       hints: isProd ? 'warning' : false,
diff --git a/yarn.lock b/yarn.lock
index 5afff4b9a41..0a95f611d20 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -21370,7 +21370,7 @@ term-size@^1.2.0:
   dependencies:
     execa "^0.7.0"
 
-terser-webpack-plugin@1.1.0:
+terser-webpack-plugin@1.1.0, terser-webpack-plugin@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/terser-webpack-plugin/-/terser-webpack-plugin-1.1.0.tgz#cf7c25a1eee25bf121f4a587bb9e004e3f80e528"
   integrity sha512-61lV0DSxMAZ8AyZG7/A4a3UPlrbOBo8NIQ4tJzLPAdGOQ+yoNC7l5ijEow27lBAL2humer01KLS6bGIMYQxKoA==