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require 'rubygems' libraries = ['open-uri', 'rack', 'rest_client', 'activerecord', 'activesupport', 'heroku', 'net/http'] libraries = [libraries[2]] # this has to be manually tweaked first_time = {} later_time = {} def time_it(&block) t = Time.now block.call Time.now - t end libraries.each do |lib| time = time_it do require lib end first_time[lib] = time n = 1000 time = time_it do n.times { require lib } end time = time / n.to_f later_time[lib] = time end libraries.each do |lib| puts "#{lib}: initial: #{first_time[lib]}, subsequent: #{(first_time[lib]/later_time[lib]).round}x" end

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