Update README.md (#1530)

README.md

@@ -3,6 +3,7 @@
          title="Promises/A+ 1.1 compliant" align="right" />
 </a>
 
+
 [![Build Status](https://travis-ci.org/petkaantonov/bluebird.svg?branch=master)](https://travis-ci.org/petkaantonov/bluebird)
 [![coverage-98%](https://img.shields.io/badge/coverage-98%25-brightgreen.svg?style=flat)](http://petkaantonov.github.io/bluebird/coverage/debug/index.html)
 
@@ -16,6 +17,10 @@ See the [**bluebird website**](http://bluebirdjs.com/docs/getting-started.html)
 
 For bluebird 2.x documentation and files, see the [2.x tree](https://github.com/petkaantonov/bluebird/tree/2.x).
 
+### Note 
+
+Promises in Node.js 10 are significantly faster than before. Bluebird still includes a lot of features like cancellation, iteration methods and warnings that native promises don't. If you are using Bluebird for performance rathe than for those - please consider giving native promises a shot and running the benchmarks yourself.
+
 # Questions and issues
 
 The [github issue tracker](https://github.com/petkaantonov/bluebird/issues) is **_only_** for bug reports and feature requests. Anything else, such as questions for help in using the library, should be posted in [StackOverflow](http://stackoverflow.com/questions/tagged/bluebird) under tags `promise` and `bluebird`.