Most efficient way of returning a constant string from a Ruby method

results.txt

Rehearsal -------------------------------------------------
with freez      1.490000   0.010000   1.500000 (  1.493176)
with constant   1.500000   0.000000   1.500000 (  1.499597)
with new        2.060000   0.000000   2.060000 (  2.064578)
---------------------------------------- total: 5.060000sec

                    user     system      total        real
with freez      1.470000   0.000000   1.470000 (  1.480206)
with constant   1.500000   0.000000   1.500000 (  1.510912)
with new        2.030000   0.000000   2.030000 (  2.038113)

string_method_test.rb

require "benchmark"

Benchmark.bmbm do |test|
  
  class MyClass
    
    FREEZ = "abcdefg".freeze
    CONST = "abcdefg"
    
    def with_const
      CONST
    end
    
    def with_strin
      "abcdefg"
    end
    
    def with_freez
      FREEZ
    end
  end
  
  TIMES = 10000000
  
  test.report "with constant" do
    TIMES.times do
      MyClass.new.with_const
    end
  end
  
  test.report "with new" do
    TIMES.times do
      MyClass.new.with_strin      
    end
  end
  
  test.report "with freez" do
    TIMES.times do
      MyClass.new.with_freez   
    end
  end
  
end