if?(isDev)?{
????config.mode?=?'development'
????}
????
????果然如此，按照樓上說的，我之前家在一次大概5秒，去除這個警告之后就很快

我剛開始也很慢 大概是1570ms，修復了webpack 開發和生產模式的mode的那個警告后，只用了43ms就好了

const?path?=?require('path')
const?{VueLoaderPlugin}?=?require('vue-loader')
const?HTMLPlugin?=?require('html-webpack-plugin')
const?webpack?=?require('webpack')

const?isDev?=?process.env.NODE_ENV?===?'development'

const?config?=?{
????target:?"web",
????mode:?"production",
????entry:?path.join(__dirname,?'src/index.js'),
????output:?{
????????filename:?"bundle.js",
????????path:?path.join(__dirname,?'dist')
????},
????module:?{
????????rules:?[
????????????{
????????????????test:?/\.vue$/,
????????????????loader:?'vue-loader'
????????????},
????????????{
????????????????test:?/\.css$/,
????????????????use:?['style-loader',?'css-loader']
????????????},
????????????{
????????????????test:?/\.(gif|jpg|jpeg|png|svg)$/,
????????????????use:?[
????????????????????{
????????????????????????loader:?'url-loader',
????????????????????????options:?{
????????????????????????????limit:?1024,
????????????????????????????name:?'[name].[ext]'
????????????????????????}
????????????????????}
????????????????]
????????????}
????????]
????},
????plugins:?[
????????new?VueLoaderPlugin(),
????????new?webpack.DefinePlugin({
????????????'process.env':{
????????????????NODE_ENV:?isDev???'"development"'?:?'"production"'
????????????}
????????}),
????????new?HTMLPlugin()
????]
}

if?(isDev)?{
????config.mode?=?'development'
????config.devtool?=?'#cheap-module-eval-source-map'
????config.devServer?=?{
????????port:?8000,
????????host:?'0.0.0.0',
????????overlay:?{
????????????errors:?true
????????},
????????hot:?true
????}
????config.plugins.push(
????????new?webpack.HotModuleReplacementPlugin(),
????????new?webpack.NodeEnvironmentPlugin()
????)
}

module.exports?=?config

現在 用的是webpack4? 視頻里用的3? 我把webpack降到3打包速度就一樣了很快，但是感覺這也不是解決辦法，等看完視頻再整體升級到4找找別的辦法

devServer 參數? open 去掉，open每次打開一個網頁肯定慢

我沒有你的問題。。。