Benchmarking require calls..

README.md

1. Modify the boot.rb file in your Rails application to reflect the one above.
2. Run rails s
3. Select all of the lines that include the following format: (000000.0) foobar required
4. Copy those lines, open TextMate and paste into a /new/ document.
5. Press F5 then press 1 to sort all lines in the document.

You can now tell which libraries/files take the longest to load.

boot.rb

require 'benchmark'

module Kernel
  alias nonbenchmarked_require require
  def require(file)
    puts Benchmark.measure("#{file} required") {
      nonbenchmarked_require(file)
    }.format("%r %n")
  end
end

require 'rubygems'

# Set up gems listed in the Gemfile.
ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)

require 'bundler/setup' if File.exists?(ENV['BUNDLE_GEMFILE'])