show slow require:s

gistfile1.rb

module Kernel
  alias_method :require_orig, :require

  def require(name)
    $indent ||= 0
    t1 = Time.now.to_f
    $indent += 2
    puts "#{" " * $indent}> #{name}"
    require_orig name
    t2 = Time.now.to_f
    if t2 - t1 > 0.1
      time = "\e[0m\e[31m%5.5f\e[0m" % [t2-t1]
    elsif t2 - t1 > 0.03
      time = "\e[0m\e[33m%5.5f\e[0m" % [t2-t1]
    else
      time = "\e[0m\e[32m%5.5f\e[0m" % [t2-t1]
    end
    puts "#{" " * $indent}< #{time} #{name}"
    $indent -= 2
  end
end