gistfile1.rb

require 'rubygems'
require 'bundler'
require 'benchmark'

Benchmark.bm do |bm|
  bm.report('Bundle.setup'.ljust(50)) do
    Bundler.setup
  end

  bm.report('require "rails/all"'.ljust(50)) do
    require 'rails/all'
    require 'active_support/all'
  end

  bm.report('Bunder.requre(:default, Rails.env)'.ljust(50)) do
    Bundler.require(:default, Rails.env)
  end

  bm.report('config/environment'.ljust(50)) do
    require './config/environment'
  end
end

gistfile2.txt

      user     system      total        real
Bundle.setup                                        0.670000   0.070000   0.740000 (  0.739912)
require "rails/all"                                 0.440000   0.210000   0.650000 (  0.646037)
Bunder.requre(:default, Rails.env)                  2.600000   0.510000   3.110000 (  3.111339)
config/environment                                  2.430000   0.250000   2.680000 (  2.690288)