DLLPlugin使え Use the DllPlugin to move code that is changed less often into a separate compilation. This will improve the application's compilation speed, although it does increase complexitity of the build process.
Smaller = Faster Decrease the total size of the compilation to increase build performance. Try to keep chunks small.
thread-loader使え The thread-loader can be used to offload expensive loaders to a worker pool.
cache-loader使え Enable persistent caching with the cache-loader. Clear cache directory on "postinstall" in package.json.
node-sassは遅いぞ node-sass has a bug which blocks threads from the Node.js threadpool. When using it with the thread- loader set workerParallelJobs: 2.