You can control the speed of playback of Watir::IE

module Watir
  class IE
    def typingspeed(speed)
      @typingspeed = speed
    end
    def sleeptime(pause)
      @defaultSleepTime = pause
    end
  end
end

ie.typingspeed = 0.2
ie.sleeptime = 0.5

Bret