investigate goliath performance issue

Gemfile

source 'https://rubygems.org'

gem 'goliath', :git =>'https://github.com/postrank-labs/goliath.git'
gem 'em-http-request'
gem 'redis'
gem "hiredis"
gem 'rbtrace'
gem 'rspec'
gem 'typhoeus'
gem 'faraday'

hello.rb

require 'goliath'
require "rbtrace"
require 'em-synchrony'
require 'em-synchrony/em-http'
#require 'redis'

class HelloWorld < Goliath::API
  def response(env)
    req = EM::HttpRequest.new("http://www.google.com/").get
    resp = req.response
    #resp = Redis.new(driver: :synchrony, host: "127.0.0.1", port: 6379).ping
    [200, {}, resp]
  end
end

hello_spec.rb

require 'spec_helper'
require 'faraday'
require 'typhoeus'
require 'typhoeus/adapters/faraday'

describe 'HelloWorld' do
  it 'should handle concurrency' do
    hydra = Faraday::Adapter::Typhoeus.setup_parallel_manager(:max_concurrency => 50)
    conn = Faraday.new(:url => "http://localhost:9000", :parallel_manager => hydra) do |builder|
      builder.request  :url_encoded
      builder.response :logger
      builder.adapter  :typhoeus
    end

      conn.in_parallel do
        200.times do |i|
          conn.get('/', {}).on_complete do |resp|
            resp[:status].should == 200
          end
        end
      end

  end

rbtrace -p 12345 --methods "HelloWorld#response"

Result:

 HelloWorld#response
   HelloWorld#response
     HelloWorld#response
                                      .....
                                                  HelloWorld#response
                                                    HelloWorld#response
                                                      HelloWorld#response
                                                        HelloWorld#response
                                                          HelloWorld#response <0.004211>
                                                        HelloWorld#response <0.012637>
                                                      HelloWorld#response <0.022030>
                                                    HelloWorld#response <0.031324>
                                                  HelloWorld#response <0.046667>
                                       ....
    HelloWorld#response <2.420847>
  HelloWorld#response <2.431626>
HelloWorld#response <2.444879>