refinement-benchmark.rb

require "benchmark/ips"
require "active_support/all"

class Hash
  def refined_symbolize_keys
    transform_keys { |key| key.to_sym rescue key }
  end
end

module HashRefinements
  refine Hash do
    def refined_symbolize_keys
      raise "never called"
    end
  end
end

HASH = {foo: 1, bar: 2, baz: 3}

Benchmark.ips do |x|
  x.report('original') { HASH.symbolize_keys }
  x.report('refined') { HASH.refined_symbolize_keys }
  x.compare!
end


class Foo
  def original
  end

  def refined
  end
end

module FooRefinements
  refine Foo do
    def refined
      raise "never called"
    end
  end
end

FOO = Foo.new

Benchmark.ips do |x|
  x.report('original') { FOO.original }
  x.report('refined') { FOO.refined }
  x.compare!
end

results.txt

$ ruby -v
ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [x86_64-darwin20]
$ ruby /tmp/refinements.rb
Warming up --------------------------------------
            original    45.445k i/100ms
             refined    40.602k i/100ms
Calculating -------------------------------------
            original    456.533k (± 0.8%) i/s -      2.318M in   5.077034s
             refined    410.539k (± 0.7%) i/s -      2.071M in   5.044141s

Comparison:
            original:   456533.1 i/s
             refined:   410539.2 i/s - 1.11x  (± 0.00) slower

Warming up --------------------------------------
            original   258.910k i/100ms
             refined   182.152k i/100ms
Calculating -------------------------------------
            original      2.595M (± 0.6%) i/s -     13.204M in   5.088884s
             refined      1.816M (± 0.5%) i/s -      9.108M in   5.015045s

Comparison:
            original:  2594845.6 i/s
             refined:  1816097.0 i/s - 1.43x  (± 0.00) slower