Mongo driver vs. Mongoid benchmark

gistfile1.rb

require 'benchmark'
require 'mongo'
require 'mongoid'
require './project'

db = Mongo::Connection.new.db('coledit_development')
Mongoid.configure do |config|
  config.master = db
end

Benchmark.bm(7) do |bm|
  bm.report('driver') do
    10000.times do
      project = db['projects'].find(:_id=>BSON::ObjectId('4e52ccbd3a5c9f20b8000003'))
      project.each { |p| p }
    end
  end
  bm.report('mongoid') do
    10000.times do
      project = Project.find('4e52ccbd3a5c9f20b8000003')
    end
  end
end