NancyFX vs Web API

Program.cs

using System;
using System.Web.Http;
using Microsoft.Owin.Hosting;
using Nancy;
using Owin;

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            string nancyAddress = "http://localhost:8000/";
            string webApiAddress = "http://localhost:9000/";

            WebApp.Start<StartupNancy>(url: nancyAddress);
            WebApp.Start<StartupWebApi>(url: webApiAddress);

            Console.ReadLine();
        }
    }

    public class StartupNancy
    {

        public void Configuration(IAppBuilder appBuilder)
        {
            appBuilder.UseNancy();
        }
    }

    public class StartupWebApi
    {
        public void Configuration(IAppBuilder appBuilder)
        {
            HttpConfiguration config = new HttpConfiguration();
            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "",
                defaults: new { controller = "Home", action = "Hello" }
            );

            appBuilder.UseWebApi(config);
        }
    }

    public class Module : NancyModule
    {
        public Module()
        {
            Get["/"] = o => "Hello from NancyFx";
        }
    }

    public class HomeController : ApiController
    {
        [HttpGet]
        public string Hello()
        {
            return "Hello from Web API";
        }
    }
}

On my machine:

NancyFx gets around 6500 req/s
WebApi gets around 30000 req/s