Have you looked at http://bluebirdjs.com/docs/api/promise.map.html http://bluebirdjs.com/docs/api/promise.map.html - which allows you to control the concurrency

Have you looked at http://bluebirdjs.com/docs/api/promise.map.html http://bluebirdjs.com/docs/api/promise.map.html - which allows you to control the concurrency of Promises easily?