web-pack sass-loader медленный с кендо для угловых

Question

Используя шаблон Visual Studio 2017+ AspNet Core Angular2 SPA от JavaScriptServices + kendo UI для узла Angular + 6.11.2, я нахожу, что веб-пакет на F5 работает медленно, примерно 50 с, для моего проекта, в котором только 3 экрана. Я работал с --profile, и, например, время сборки sass-загрузчика, похоже, составляет 14 с (см. Последнюю строку), это нормально? Я знаю, что это старая версия webpack, но пакет aspnet-webpack имеет одноранговую зависимость, поэтому не думайте, что я могу легко обновиться.

node node_modules/webpack/bin/webpack.js --display-chunks --profile
Hash: c26022140be6adfd9fc78ed6696c3ce053c09701
Version: webpack 2.5.1
Child
    Hash: c26022140be6adfd9fc7
    Time: 50574ms
                 Asset      Size  Chunks                    Chunk Names
        main-client.js   4.54 MB       0  [emitted]  [big]  main-client
              main.css    456 kB       0  [emitted]  [big]  main-client
    main-client.js.map   4.96 MB       0  [emitted]         main-client
          main.css.map  85 bytes       0  [emitted]         main-client
    chunk    {0} main-client.js, main.css, main-client.js.map, main.css.map (main-client) 3.91 MB [entry] [rendered]
        [0] delegated ./node_modules/@angular/core/@angular/core.es5.js from dll-reference vendor_f7dfad4be673dc844a12 42 bytes {0} [not cacheable] [built]
            [] -> factory:3260ms building:0ms dependencies:0ms = 3260ms
       [49] ./~/@angular/common/@angular/common/http.es5.js 82.8 kB {0} [built]
            [] -> factory:7707ms building:980ms dependencies:1018ms = 9705ms
      [210] ./ClientApp/app/claim.service.ts 2.29 kB {0} [built]
            [] -> factory:48ms building:332ms dependencies:7327ms = 7707ms
      [223] delegated ./node_modules/webpack/buildin/global.js from dll-reference vendor_f7dfad4be673dc844a12 42 bytes {0} [not cacheable] [built]
            [] -> factory:7620ms building:0ms dependencies:0ms = 7620ms
      [461] ./ClientApp/app/auth-guard.service.ts 1.46 kB {0} [built]
            [] -> factory:48ms building:342ms dependencies:8238ms = 8628ms
      [591] delegated ./node_modules/@angular/platform-browser/@angular/platform-browser.es5.js from dll-reference vendor_f7dfad4be673dc844a12 42 bytes {0} [not cacheable] [built]
            [] -> factory:4061ms building:0ms dependencies:0ms = 4061ms
      [596] ./ClientApp/app/app.module.browser.ts 1.99 kB {0} [built]
            [] -> factory:3137ms building:83ms dependencies:40ms = 3260ms
      [597] ./~/core-js/client/shim.js 228 kB {0} [built]
            [] -> factory:3227ms building:279ms = 3506ms
      [598] ./~/reflect-metadata/Reflect.js 48 kB {0} [built]
            [] -> factory:3174ms building:142ms = 3316ms
      [599] delegated ./node_modules/@angular/platform-browser-dynamic/@angular/platform-browser-dynamic.es5.js from dll-reference vendor_f7dfad4be673dc844a12 42 bytes {0} [not cacheable] [built]
            [] -> factory:3261ms building:0ms dependencies:0ms = 3261ms
      [600] delegated ./node_modules/bootstrap/dist/js/npm.js from dll-reference vendor_f7dfad4be673dc844a12 42 bytes {0} [not cacheable] [built]
            [] -> factory:3271ms building:0ms dependencies:1ms = 3272ms
      [601] delegated ./node_modules/zone.js/dist/zone.js from dll-reference vendor_f7dfad4be673dc844a12 42 bytes {0} [not cacheable] [built]
            [] -> factory:3259ms building:0ms = 3259ms
      [843] ./ClientApp/app/interceptors/date-tz.interceptor.ts 3.1 kB {0} [built]
            [] -> factory:55ms building:428ms dependencies:7224ms = 7707ms
      [844] ./ClientApp/boot.browser.ts 1 kB {0} [built]
             factory:36ms building:3767ms = 3803ms
      [932] delegated ./node_modules/process/browser.js from dll-reference vendor_f7dfad4be673dc844a12 42 bytes {0} [not cacheable] [built]
            [] -> factory:7599ms building:0ms dependencies:0ms = 7599ms
         + 929 hidden modules
    Child extract-text-webpack-plugin:
        chunk    {0} extract-text-webpack-plugin-output-filename 474 kB [entry] [rendered]
            [0] ./~/css-loader/lib/css-base.js 2.26 kB {0} [built]
                [] -> factory:3ms building:7ms = 10ms
            [1] ./~/css-loader!./~/sass-loader/lib/loader.js!./styles.scss 471 kB {0} [built]
                 factory:7ms building:9948ms = 9955ms
Child
    Hash: 8ed6696c3ce053c09701
    Time: 50697ms
             Asset     Size  Chunks                    Chunk Names
    main-server.js  11.3 MB       0  [emitted]  [big]  main-server
          main.css   456 kB       0  [emitted]  [big]  main-server
    chunk    {0} main-server.js, main.css (main-server) 4.2 MB [entry] [rendered]
        [0] delegated ./node_modules/@angular/core/bundles/core.umd.js from dll-reference ./vendor 42 bytes {0} [not cacheable] [built]
            [] -> factory:149ms building:0ms dependencies:0ms = 149ms
        [4] delegated ./node_modules/rxjs/Observable.js from dll-reference ./vendor 42 bytes {0} [not cacheable] [built]
            [] -> factory:180ms building:0ms dependencies:0ms = 180ms
        [6] delegated ./node_modules/@angular/common/bundles/common.umd.js from dll-reference ./vendor 42 bytes {0} [not cacheable] [built]
            [] -> factory:147ms building:0ms dependencies:0ms = 147ms
       [14] delegated ./node_modules/rxjs/Subject.js from dll-reference ./vendor 42 bytes {0} [not cacheable] [built]
            [] -> factory:181ms building:0ms dependencies:0ms = 181ms
      [184] ./~/@angular/platform-server/bundles/platform-server.umd.js 80.3 kB {0} [built]
            [] -> factory:147ms building:266ms dependencies:139ms = 552ms
      [509] delegated ./node_modules/rxjs/operator/first.js from dll-reference ./vendor 42 bytes {0} [not cacheable] [built]
            [] -> factory:3763ms building:0ms dependencies:0ms = 3763ms
      [512] ./ClientApp/app/app.module.server.ts 1.05 kB {0} [built]
            [] -> factory:40ms building:83ms dependencies:26ms = 149ms
      [513] ./~/reflect-metadata/Reflect.js 48 kB {0} [built]
            [] -> factory:113ms building:113ms = 226ms
      [514] ./~/rxjs/add/operator/first.js 199 bytes {0} [built]
            [] -> factory:149ms building:304ms dependencies:3723ms = 4176ms
      [515] delegated ./node_modules/aspnet-prerendering/index.js from dll-reference ./vendor 42 bytes {0} [not cacheable] [built]
            [] -> factory:129ms building:0ms = 129ms
      [516] delegated ./node_modules/zone.js/dist/zone-node.js from dll-reference ./vendor 42 bytes {0} [not cacheable] [built]
            [] -> factory:147ms building:0ms dependencies:0ms = 147ms
      [670] ./ClientApp/app/app.module.shared.ts 2.95 kB {0} [built]
            [] -> factory:36ms building:384ms dependencies:7375ms = 7795ms
      [678] ./ClientApp/boot.server.ts 1.65 kB {0} [built]
             factory:40ms building:6873ms = 6913ms
      [771] ./~/xhr2/lib/xhr2.js 26 kB {0} [built]
            [] -> factory:8313ms building:935ms dependencies:0ms = 9248ms
      [773] delegated ./node_modules/@angular/compiler/bundles/compiler.umd.js from dll-reference ./vendor 42 bytes {0} [not cacheable] [built]
            [] -> factory:8310ms building:0ms dependencies:0ms = 8310ms
         + 774 hidden modules
    Child extract-text-webpack-plugin:
        chunk    {0} extract-text-webpack-plugin-output-filename 474 kB [entry] [rendered]
            [0] ./~/css-loader/lib/css-base.js 2.26 kB {0} [built]
                [] -> factory:0ms building:69ms = 69ms
            [1] ./~/css-loader!./~/sass-loader/lib/loader.js!./styles.scss 471 kB {0} [built]
                 factory:10ms building:14361ms = 14371ms

webpack.config.js:

const path = require('path');
const webpack = require('webpack');
const merge = require('webpack-merge');
const AotPlugin = require('@ngtools/webpack').AotPlugin;
const CheckerPlugin = require('awesome-typescript-loader').CheckerPlugin;
const ExtractTextPlugin = require('extract-text-webpack-plugin');
const Uglify = require("uglifyjs-webpack-plugin");

module.exports = (env) => {
    // Configuration in common to both client-side and server-side bundles
    const isDevBuild = !(env && env.prod);
    const extractCSS = new ExtractTextPlugin('main.css');
    const sharedConfig = {
        stats: { modules: false },
        context: __dirname,
        resolve: { extensions: [ '.js', '.ts' ] },
        output: {
            filename: '[name].js',
            publicPath: 'dist/' // Webpack dev middleware, if enabled, handles requests for this URL prefix
        },
        module: {
            rules: [
                { test: /\.ts$/, use: isDevBuild ? ['awesome-typescript-loader?silent=true', 'angular2-template-loader'] : '@ngtools/webpack' },
                { test: /\.html$/, use: 'html-loader?minimize=false' },
                { test: /\.css$/, use: [ 'to-string-loader', isDevBuild ? 'css-loader' : 'css-loader?minimize' ] },
                { test: /\.(png|jpg|jpeg|gif|svg)$/, use: 'url-loader?limit=25000' },
                {
                    test: /\.scss$/,
                    // exclude: /node_modules/,
                    use: extractCSS.extract({
                        use: ['css-loader', 'sass-loader']
                    })
                },
            ]
        },
        plugins: [new CheckerPlugin(), extractCSS]
    };

    // Configuration for client-side bundle suitable for running in browsers
    const clientBundleOutputDir = './wwwroot/dist';
    const clientBundleConfig = merge(sharedConfig, {
        entry: { 'main-client': './ClientApp/boot.browser.ts' },
        output: { path: path.join(__dirname, clientBundleOutputDir) },
        plugins: [
            new webpack.DllReferencePlugin({
                context: __dirname,
                manifest: require('./wwwroot/dist/vendor-manifest.json')
            })
        ].concat(isDevBuild ? [
            // Plugins that apply in development builds only
            new webpack.SourceMapDevToolPlugin({
                filename: '[file].map', // Remove this line if you prefer inline source maps
                moduleFilenameTemplate: path.relative(clientBundleOutputDir, '[resourcePath]') // Point sourcemap entries to the original file locations on disk
            })
        ] : [
            // Plugins that apply in production builds only
//                new webpack.optimize.UglifyJsPlugin(), -- does not do es6
            new Uglify(),
            new AotPlugin({
                tsConfigPath: './tsconfig.json',
                entryModule: path.join(__dirname, 'ClientApp/app/app.module.browser#AppModule'),
                exclude: ['./**/*.server.ts'],
            })
        ])
    });

    // Configuration for server-side (prerendering) bundle suitable for running in Node
    const serverBundleConfig = merge(sharedConfig, {
        resolve: { mainFields: ['main'] },
        entry: { 'main-server': './ClientApp/boot.server.ts' },
        plugins: [
            new webpack.DllReferencePlugin({
                context: __dirname,
                manifest: require('./ClientApp/dist/vendor-manifest.json'),
                sourceType: 'commonjs2',
                name: './vendor'
            })
        ].concat(isDevBuild ? [] : [
            // Plugins that apply in production builds only
            new AotPlugin({
                tsConfigPath: './tsconfig.json',
                entryModule: path.join(__dirname, 'ClientApp/app/app.module.server#AppModule'),
                exclude: ['./**/*.browser.ts']
            })
        ]),
        output: {
            libraryTarget: 'commonjs',
            path: path.join(__dirname, './ClientApp/dist')
        },
        target: 'node',
        devtool: 'inline-source-map'
    });

    return [clientBundleConfig, serverBundleConfig];
};

style.scss:

$button-bg: #0091D7;
$button-text: #ffffff;
$accent: #0190D6;

@import "~@progress/kendo-theme-default/scss/all";