1_using_win32console.log

>ruby -v
ruby 1.9.2p0 (2010-08-18) [i386-mingw32]
>timer ruby -rwin32console test.rb
real    11.299
system  1.185
user    2.480

2_using_ansicon.log

>ruby -v
ruby 1.9.2p0 (2010-08-18) [i386-mingw32]
>timer ruby test.rb
real    9.240
system  0.904
user    0.608

test.rb

class String
  def red
    "\e[31m#{self}\e[0m"
  end

  def yellow
    "\e[33m#{self}\e[0m"
  end

  def green
    "\e[32m#{self}\e[0m"
  end
end

def output
  10_000.times do
    print "E".red, "*".yellow, ".".green
  end
end

output