使用create-react-app 搭建antd的环境，为了修改antd主题，引用了antd的loader， 配置了按需加载

plugins: [
     ['import', { libraryName: 'antd', libraryDirectory: 'es', style: true }],
],

less loader加载antd的less， 在文件里引入antd的less， 
import 'antd/dist/antd.less'; 项目可以正常运行，就是编译特别慢，每次改动一个文件都要编译20秒，有没有人遇到同样的问题？

{
            test: /\.less$/,
            include: /node_modules/,
            use: [
              require.resolve('style-loader'),
              {
                loader: require.resolve('css-loader'),
                options: {
                  importLoaders: 1,
                },
              },
              {
                loader: require.resolve('postcss-loader'),
                options: {
                  // Necessary for external CSS imports to work
                  // https://github.com/facebookincubator/create-react-app/issues/2677
                  ident: 'postcss',
                  plugins: () => [
                    require('postcss-flexbugs-fixes'),
                    autoprefixer({
                      browsers: [
                        '>1%',
                        'last 4 versions',
                        'Firefox ESR',
                        'not ie < 9', // React doesn't support IE8 anyway
                      ],
                      flexbox: 'no-2009',
                    })
                  ],
                },
              },
              {
                loader: require.resolve('less-loader'),
                options: {
                  // theme vars, also can use theme.js instead of this.
                  modifyVars: theme,
                },
              },
            ]
          },