What is faster? FastNoise or OpenSimplex?

I'm such a fool, I forgot to mention that I mean in C#

I made a little test to find out what is faster. SimplexFractal or OpenSimplex. Here is the project

https://github.com/MarkuBu/noiseperf

These are the original libraries

https://github.com/Auburns/FastNoise_CSharp

https://gist.github.com/digitalshadow/134a3a02b67cecd72181

I added octaves to OpenSimplex and I assume, that I should get similar results. I generate a 1024x1024 heightmap using Parallel.For to get more speed.

To my surprise OpenSimplex is significantly faster. On my PC FastNoise needs ~300ms, OpenSimplex only needs ~200ms.

Did I made a mistake somewhere or is OpenSimplex really faster?

Edit: got similar results without Parallel.For. ~1100ms vs. ~840ms

My System: AMD FX-6300, Ubuntu 16.04, Mono 5.0