webpack-dev-server 老是卡住！！为何？

Question

我的配置文件：

webpack.common.js ：

const path = require('path');
const CleanWebpackPlugin = require('clean-webpack-plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const VueLoaderPlugin = require('vue-loader/lib/plugin');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
// 编译后文件输出路径
const outputDir = 'compiled';

module.exports = {
    // 入口
    entry: {
        // 单一入口
        app_v1: ['babel-polyfill' , './source/app.js']
    } ,
    plugins: [
        new CleanWebpackPlugin([outputDir]),
        new HtmlWebpackPlugin({
            filename: 'app.html' ,
            template: 'template.html'
        }) , 
        new VueLoaderPlugin() , 
        new MiniCssExtractPlugin({
            filename: "[name].css" ,
            chunkFilename: "[id].css"
        }) ,
    ] , 
    output: {
        filename: 'js/[name].js' , 
        path: path.resolve(__dirname , outputDir)
    } , 
    module: {
        rules: [
            {
                test: /\.js/ ,
                // 如果不排除 node_modules，babel 编译速度将会非常慢
                exclude: /node_modules/ , 
                use: {
                    loader: 'babel-loader' ,
                    options: {
                        "presets": ["@babel/preset-env"] ,
                        plugins: [
                            // 提升运行速度 详情请查看 https://webpack.js.org/loaders/babel-loader/#root
                            '@babel/plugin-transform-runtime' ,
                            // 支持动态导入语法
                            '@babel/plugin-syntax-dynamic-import' ,
                        ]
                    }
                }
            } , 
            {
                test: /\.css/ , 
                use: [
                    MiniCssExtractPlugin.loader ,
                    // 'vue-style-loader' ,
                    {
                        loader: 'css-loader' , 
                        options: {
                            sourceMap: true
                        }
                    }
                ]
            } , 
            {
                test: /\.(png|svg|jpg|gif)$/ , 
                use: [
                    {
                        loader: 'file-loader' , 
                        options: {
                            name: 'assets/image/[name].[ext]'
                        }
                    }
                ]
            } , 
            {
                test: /\.vue$/ , 
                loader: 'vue-loader'
            } , 
            {
                test: /\.(woff|woff2|eot|ttf|otf)$/ ,
                use: [
                    {
                        loader: 'file-loader' ,
                        options: {
                            name: '[name].[ext]'
                        }
                    }
                ],
            }
        ]
    } , 
    resolve: {
        alias: {
            
        }
    }
};

webpack.dev.js ：

const path = require('path');
const merge = require('webpack-merge');
const common = require('./webpack.common.js');

module.exports = merge(common , {
    mode: 'development' , 
    devtool: 'inline-source-map' , 
    devServer: {
        contentBase: path.resolve('../../') ,
        index: 'app.html' ,
        host: '127.0.0.1' ,
        port: 9000 ,
    }
});

运行一段时间就卡住，然后 ctrl + c 终止，再必须再任务管理器中结束 nodejs 进程，否则无法再运行！

非常频繁，太频繁了！为啥会出现这种情况？webpack-dev-server 如此不稳定吗？