webpack-dev-server builds and rebuilds very slow

I found a solution to remove the following: instead of

 entry: { pit: [babel-polyfill', './index.js', './src/shared/styles.less'] }, 

you need remove heavy loaded babel-polyfill'. So you have in this part:

 entry: { pit: [ './index.js', './src/shared/styles.less'] }, 

and you need to remove heavy executable rule:

 { test: /\.(htm|html|xhtml|hbs|handlebars|php|ejs)$/i, exclude: /node_modules/, loader: "file?name=[name].[ext]", }, 

As a result you will have quite quick script for webpack-dev-server:

'use strict'; var path = require('path'); var webpack = require('webpack'); var glob = require("glob"); module.exports = { entry: { pit: [ './index.js', './src/shared/styles.less'] }, output: { path: path.resolve(__dirname, 'dist/'), //publicPath: '/', filename: 'bundle.[name].js' }, module: { rules: [ { test: /(\.js[\S]{0,1})$/i, exclude: /node_modules/, loaders: ['babel-loader?presets[]=env&presets[]=react&presets[]=stage-0&presets[]=stage-2'] }, { test: /\.css$/i, exclude: [/node_modules/], loader: 'style-loader!css-loader' }, { test: /\.less$/i, exclude: /node_modules/, use: [{ loader: "style-loader" // creates style nodes from JS strings }, { loader: "css-loader" // translates CSS into CommonJS }, { loader: "less-loader" // compiles Less to CSS }] }, // this rule handles images { test: /\.woff(2)?(\?v=[0-9]\.[0-9]\.[0-9])?$/, loader: "url-loader?limit=10000&mimetype=application/font-woff" }, { test: /\.(ttf|eot|svg)(\?v=[0-9]\.[0-9]\.[0-9])?$/, loader: "file-loader" }, { test: /\.(jpe?g|png|gif)$/i, exclude: /node_modules/, use: [ 'url-loader?limit=10000', 'img-loader', 'file-loader?name=[name].[ext]?[hash]' ] }, { test: /\.json$/, exclude: /node_modules/, loader: "json-loader" }, // the following 3 rules handle font extraction { test: /\.woff(2)?(\?v=[0-9]\.[0-9]\.[0-9])?$/, loader: 'url-loader?limit=10000&mimetype=application/font-woff' }, { test: /\.(ttf|eot)(\?v=[0-9]\.[0-9]\.[0-9])?$/, loader: 'file-loader' }, { test: /\.otf(\?.*)?$/, use: 'file-loader?name=/fonts/[name]. [ext]&mimetype=application/font-otf' } ] }, plugins : [ new webpack.ProvidePlugin({ "React": "react", 'react-dom': 'ReactDOM' }) ], resolve: { extensions: ['.js', '.es6', '.jsx', 'less','config','variables','overrides'] }, performance: { hints: false }, watch: false, target: 'web', devServer: { stats: { colors: true, chunks: false, hash: false, version: false, timings: false, assets: false, reasons: false, children: false, source: false, errors: false, errorDetails: false, warnings: false, noInfo: true } }, externals: [ {pg: true} ], node: { fs: 'empty' } };