perf: improve build speed

In practice, both thread-loader and cache (uglify, babel, cache-loader) slow down process up to 10sec with their overhead so disabled by default.

lib/builder/builder.mjs

@@ -18,6 +18,7 @@ import upath from 'upath'
 import { r, wp, wChunk, createRoutes, parallel, relativeTo, waitFor, createSpinner } from '../common/utils'
 import Options from '../common/options'
 
+import PerfLoader from './webpack/utils/perf-loader'
 import ClientWebpackConfig from './webpack/client'
 import ServerWebpackConfig from './webpack/server'
 
@@ -39,6 +40,9 @@ export default class Builder {
     this.webpackHotMiddleware = null
     this.filesWatcher = null
     this.customFilesWatcher = null
+    this.perfLoader = null
+
+    // Shared spinner
     this.spinner = createSpinner({ minimal: this.options.minimalCLI })
     this.spinner.enabled = !this.options.test
 
@@ -419,7 +423,8 @@ export default class Builder {
   }
 
   async webpackBuild() {
-    debug('Building files...')
+    this.perfLoader = new PerfLoader(this)
+
     const compilersOptions = []
 
     // Client
@@ -449,7 +454,7 @@ export default class Builder {
       }
     })
 
-    // Initialize compilers
+    // Configure compilers
     this.compilers = compilersOptions.map(compilersOption => {
       const compiler = webpack(compilersOption)
 
@@ -461,6 +466,13 @@ export default class Builder {
       return compiler
     })
 
+    // Warmup perfLoader before build
+    if (this.options.build.parallel) {
+      this.spinner.start('Warming up worker pools')
+      this.perfLoader.warmup()
+      this.spinner.succeed('Worker pools ready')
+    }
+
     // Start Builds
     await parallel(this.compilers, compiler => {
       return this.webpackCompile(compiler)

lib/builder/webpack/base.mjs

@@ -99,34 +99,6 @@ export default class WebpackBaseConfig {
     }
   }
 
-  perfLoaders(_baseLoaders) {
-    if (this.options.dev) {
-      return _baseLoaders
-    }
-
-    const loaders = []
-
-    if (this.options.build.cache) {
-      // https://github.com/webpack-contrib/cache-loader
-      loaders.push({
-        loader: 'cache-loader',
-        options: {
-          cacheDirectory: path.resolve('node_modules/.cache/cache-loader')
-        }
-      })
-    }
-
-    if (this.options.build.parallel) {
-      // https://github.com/webpack-contrib/thread-loader
-      loaders.push({
-        loader: 'thread-loader',
-        options: {}
-      })
-    }
-
-    return loaders.concat(_baseLoaders)
-  }
-
   rules() {
     const styleLoader = new StyleLoader(
       this.options,
@@ -134,6 +106,8 @@ export default class WebpackBaseConfig {
       { isServer: this.isServer }
     )
 
+    const perfLoader = this.builder.perfLoader
+
     return [
       {
         test: /\.vue$/,
@@ -143,56 +117,62 @@ export default class WebpackBaseConfig {
       {
         test: /\.jsx?$/,
         exclude: /node_modules/,
-        use: this.perfLoaders({
+        use: perfLoader.pool('js', {
           loader: 'babel-loader',
           options: this.getBabelOptions()
         })
       },
       {
         test: /\.css$/,
-        use: styleLoader.apply('css')
+        use: perfLoader.pool('css', styleLoader.apply('css'))
       },
       {
         test: /\.less$/,
-        use: styleLoader.apply('less', 'less-loader')
+        use: perfLoader.pool('css', styleLoader.apply('less', 'less-loader'))
       },
       {
         test: /\.sass$/,
-        use: styleLoader.apply('sass', {
+        use: perfLoader.pool('css', styleLoader.apply('sass', {
           loader: 'sass-loader',
           options: { indentedSyntax: true }
-        })
+        }))
       },
       {
         test: /\.scss$/,
-        use: styleLoader.apply('scss', 'sass-loader')
+        use: perfLoader.pool('css', styleLoader.apply('scss', 'sass-loader'))
       },
       {
         test: /\.styl(us)?$/,
-        use: styleLoader.apply('stylus', 'stylus-loader')
+        use: perfLoader.pool('css', styleLoader.apply('stylus', 'stylus-loader'))
       },
       {
         test: /\.(png|jpe?g|gif|svg)$/,
+        use: perfLoader.pool('assets', {
           loader: 'url-loader',
           options: {
             limit: 1000, // 1KO
             name: 'img/[name].[hash:7].[ext]'
           }
+        })
       },
       {
         test: /\.(woff2?|eot|ttf|otf)(\?.*)?$/,
+        use: perfLoader.pool('assets', {
           loader: 'url-loader',
           options: {
             limit: 1000, // 1 KO
             name: 'fonts/[name].[hash:7].[ext]'
           }
+        })
       },
       {
         test: /\.(webm|mp4)$/,
+        use: perfLoader.pool('assets', {
           loader: 'file-loader',
           options: {
             name: 'videos/[name].[hash:7].[ext]'
           }
+        })
       }
     ]
   }

lib/builder/webpack/client.mjs

@@ -112,7 +112,7 @@ export default class WebpackClientConfig extends WebpackBaseConfig {
       config.optimization.minimizer = [
         new UglifyJsWebpackPlugin({
           parallel: true,
-          cache: true,
+          cache: this.options.build.cache,
           sourceMap: false
         })
       ]

lib/builder/webpack/plugins/progress.mjs

@@ -44,7 +44,8 @@ export default class ProgressPlugin extends webpack.ProgressPlugin {
     const progress = Math.floor(percent * 100)
 
     this.state.progress = progress
-    this.state.msg = (msg && msg.length) ? msg : 'wait'
+    this.state.msg = (msg && msg.length) ? msg : (progress === 100 ? 'done' : 'still building')
+    this.state.details = details
 
     // Process all states
     let inProgress = false
@@ -72,7 +73,9 @@ export default class ProgressPlugin extends webpack.ProgressPlugin {
     if (!inProgress) {
       logUpdate.clear()
     } else {
-      logUpdate('\n' + lines.join('\n') + '\n')
+      const title = chalk.bgRedBright.black('BUILDING')
+
+      logUpdate('\n' + title + '\n\n' + lines.join('\n'))
     }
   }
 

lib/builder/webpack/utils/perf-loader.mjs

@@ -0,0 +1,60 @@
+import path from 'path'
+
+import threadLoader from 'thread-loader'
+
+// https://github.com/webpack-contrib/thread-loader
+// https://github.com/webpack-contrib/cache-loader
+
+export default class PerfLoader {
+  constructor(builder) {
+    this.builder = builder
+    this.options = builder.options
+
+    this.workerPools = {
+      js: {
+        name: 'js',
+        poolTimeout: this.options.dev ? Infinity : 2000
+
+      },
+      css: {
+        name: 'css',
+        poolTimeout: this.options.dev ? Infinity : 2000
+      }
+    }
+  }
+
+  warmup() {
+    if (!this.options.build.parallel) {
+      return
+    }
+
+    threadLoader.warmup(this.workerPools.js, ['babel-loader', 'babel-preset-env'])
+    threadLoader.warmup(this.workerPools.css, ['css-loader'])
+  }
+
+  pool(poolName, _loaders) {
+    const loaders = [].concat(_loaders)
+
+    if (this.options.build.parallel) {
+      const pool = this.workerPools[poolName]
+
+      if (pool) {
+        loaders.unshift({
+          loader: 'thread-loader',
+          options: pool
+        })
+      }
+    }
+
+    if (this.options.build.cache) {
+      loaders.unshift({
+        loader: 'cache-loader',
+        options: {
+          cacheDirectory: path.resolve('node_modules/.cache/cache-loader')
+        }
+      })
+    }
+
+    return loaders
+  }
+}

lib/common/nuxt.config.js

@@ -37,8 +37,8 @@ export default {
     extractCSS: false,
     cssSourceMap: undefined,
     ssr: undefined,
-    parallel: os.cpus().length > 1,
+    parallel: false,
-    cache: true,
+    cache: false,
     publicPath: '/_nuxt/',
     filenames: {
       app: '[name].[chunkhash].js',

lib/common/options.mjs

@@ -143,7 +143,7 @@ Options.from = function (_options) {
 
   // babel cacheDirectory
   if (options.build.babel.cacheDirectory === undefined) {
-    options.build.babel.cacheDirectory = options.dev
+    options.build.babel.cacheDirectory = options.dev && options.build.cache
   }
 
   // Resource hints