I use DllPlugin to optimize packaging. The packaged dll.js files include 810kb and vendor.js 264kb , and the time is only 3 seconds faster
.
DllPluginvendor.js513kb
element-uiDllPlugin
npm run build / building for production 
webpack.dll.conf.js is as follows:
const path = require("path");
const webpack = require("webpack");
module.exports = {
entry: {
vendor: [
"vue",
"vue-router",
"vuex",
"axios",
"element-ui",
"qs",
"signalr"
]
// polyfill:["core-js/fn/promise","whatwg-fetch"]
},
output: {
path: path.join(__dirname, "../static/dll"),
filename: "[name].dll.js",
library: "[name]_library",
},
plugins: [
new webpack.optimize.UglifyJsPlugin({ // uglifjs
compress: {
warnings: false
}
}),
new webpack.DllPlugin({
path: path.join(__dirname, "dll", "[name]-manifest.json"),
name: "[name]_library", // output.library
context: __dirname
})
]
};