immutable.js is much faster than native javascript

Immutable.js is a library that provides immutable collections for JavaScript, inspired by Clojure collections. It has been developed by Facebook. As they explain on their website: Immutable data cannot be changed once created, leading to much simpler application development, no defensive copying, and enabling advanced memoization and change detection techniques with simple logic. Persistent data p

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JS標準のArray.pushが71msかかる処理を、Immutable.jsのListだと3msで済む（ただし最初の生成時間は1ms:177ms）