Link to Gitter and benchmarks by @abeimler

Author: alecthomas

README.md

@@ -22,10 +22,14 @@ See [below](#installation) for installation instructions.
 
 ## Contact
 
-EntityX now has a mailing list! Send a mail to [[email protected]](mailto:[email protected]) to subscribe. Instructions will follow.
+Feel free to jump on my [Gitter channel](https://gitter.im/alecthomas/Lobby) if you have any questions/comments. This is a single channel for all of my projects, so please mention you're asking about EntityX to avoid (my) confusion.
 
 You can also contact me directly via [email](mailto:[email protected]) or [Twitter](https://twitter.com/alecthomas).
 
+## Benchmarks / Comparisons
+
+EntityX includes its own benchmarks, but @abeimler has created [a benchmark suite](https://github.com/abeimler/ecs_benchmark/blob/master/doc/BenchmarkResultDetails2.md) testing up to 2M entities in EntityX, the EntityX compile-time branch, Anax, and Artemis C++.
+
 ## Recent Notable Changes
 
 - 2014-03-02 - (1.0.0alpha1) Switch to using cache friendly component storage (big breaking change). Also eradicated use of `std::shared_ptr` for components.