问个 webpack happypack 服务器多线程打包超长时间的问题

问个问题： 前端打包，webpack happypack 做了多线程的优化 cpu x 处理器 6 核 12 线程 主频 3.0 的，打包 30 分钟 我的 mac pro 4 核 8 线程 主频 2.6 的打包 300s

除了主频还有什么是什么影响 cpu 计算速度？

    Entrypoint mini-css-extract-plugin = *
       5 modules
[WEBPACK] Building 2 targets
[WEBPACK] Started building static/js/renderer.[chunkhash].js
[WEBPACK] Started building static/js/renderer.[chunkhash].js
Happy[happyBabel]: Version: 5.0.1. Threads: 2 (shared pool)
(node:7022) DeprecationWarning: Tapable.plugin is deprecated. Use new API on `.hooks` instead
Happy[happyBabel]: Version: 5.0.1. Threads: 2 (shared pool)
(node:7016) DeprecationWarning: Tapable.plugin is deprecated. Use new API on `.hooks` instead
Happy[happyBabel]: All set; signaling webpack to proceed.
Happy[happyBabel]: All set; signaling webpack to proceed.
Node#moveTo was deprecated. Use Container#append.
Node#moveTo was deprecated. Use Container#append.
[WEBPACK] Finished building static/js/renderer.[chunkhash].js within 1960.241 seconds
[WEBPACK] Finished building static/js/renderer.[chunkhash].js within 2574.375 seconds
[WEBPACK] Finished build after 2578.462 seconds
  Build complete.

日志上看 Happy 是启动了的，但是设置的自动，看起来

Version: 5.0.1. Threads: 2 

只开启了两个线程，但是 40minn 也很离谱

V 友们能帮助给点思路吗？