Logging Rails Loading Times

environment.rb

# Start tracking how much time you lose by loading Rails constantly
# by adding a couple of lines to config/environment.rb
# The first one is on top, the rest at the bottom of the file...
start_time = Time.now

# Load the rails application
require File.expand_path('../application', __FILE__)

# Initialize the rails application
YOUR_APPLICATION_NAME::Application.initialize!

loading_time = Time.now - start_time
puts "Loaded Rails in %.3f seconds" % loading_time
File.open(File.join(ENV['HOME'], "rails-load-times.csv"), "a") do |f|
  f.puts "#{loading_time}, #{start_time}, #{Rails.version}, #{RUBY_VERSION}, #{Rails.root}, #{Rails.env}, #{([$0]+ARGV).join(' ')}"
end