gistfile1.txt

# NOTE: had to keep the number of iterations very very low or my system would grind to a halt

ruby bench_rotate.rb
performing 5 iterations...
      user     system      total        real
Devil  0.650000   0.110000   0.760000 (  1.114564)
RMagick  5.360000   0.690000   6.050000 (  7.602843)

gistfile2.rb

require 'rubygems'
require 'benchmark'
require 'RMagick'
require 'devil'

N = 5
puts "performing #{N} iterations..."

@dimg = Devil.load("tank.png")
@rimg = Magick::Image.read("tank.png").first

Benchmark.bm do |x|
    x.report("Devil") {
        
        N.times { 
            @dimg.rotate(-45)
        }
    }

    x.report("RMagick") {
        
        N.times { 
            @rimg.rotate!(45)
        }
    }
end