#!/usr/bin/ruby

[10, 20, 25, 30, 50, 60].each{|fps|
   t0 = Time.now.to_f
   (fps * 10).times{|i|
      print "\r#{i} @ #{fps} fps"
      sleep (1.0 / fps)
   }
   t1 = Time.now.to_f
   print "\nElapsed = #{t1 - t0}, fps = #{(fps * 10) / (t1 - t0)}\n"
}