Omtimize playground load time

packages/mindplot/webpack.common.js

@@ -9,9 +9,6 @@ module.exports = {
       type: 'umd',
     },
   },
-  optimization: {
-    usedExports: true,
-  },
   entry: {
     mindplot: './src/index.js',
     loader: './src/indexLoader.js',

packages/mindplot/webpack.playground.js

@@ -6,6 +6,7 @@ const common = require('./webpack.common');
 const { merge } = require('webpack-merge');
 
 const playgroundConfig = {
+  mode: 'development',
   entry: {
     layout: path.resolve(__dirname, './test/playground/layout/context-loader'),
     viewmode: path.resolve(__dirname, './test/playground/map-render/js/viewmode'),

packages/mindplot/webpack.prod.js

@@ -1,16 +1,11 @@
 const { merge } = require('webpack-merge');
-const CompressionPlugin = require('compression-webpack-plugin');
 const common = require('./webpack.common');
 
 const prodConfig = {
   optimization: {
+    usedExports: true,
     minimize: true,
   },
-  plugins: [
-    new CompressionPlugin({
-      test: /\.js(\?.*)?$/i,
-    }),
-  ],
 };
 
 module.exports = merge(common, prodConfig);