Why I am switching to promises

Promises are not slow. At least, not anymore. Infact, bluebird generators are almost as fast as regular callback code (they're also the fastest generators as of now). And bluebird promises are definitely at least two times faster than async.waterfall. Considering that bluebird wraps the underlying callback-based libraries and makes your own callbacks exception-safe, this is really amazing. async.w

[gologo13]

promiseに関するよいまとめ

[PaulYamamoto]

Promiseに関するすごい資料。また読み返すと思う。

[efcl]

Promiseの利点について。 throw-safeなエラーハンドリング、パフォーマンスとメモリ消費、promise.nodeifyを使ったコールバックスタイルとの互換性、Promiseの書き方やユースケース等まとまってる