Benchmark for ActiveView asset_path helper

asset_path_after.rb

URI_REGEXP = %r{^[-a-z]+://|^(?:cid|data):|^//}i
def asset_path(source, options = {})
  source = source.to_s
  return "" unless source.present?
  return source if source =~ URI_REGEXP

  tail = source[/([\?#].+)$/] || ''
  source.chomp!(tail)

  if extname = compute_asset_extname(source, options)
    source.concat(extname)
  end

  unless source.start_with?('/'.freeze)
    source = compute_asset_path(source, options)
  end

  relative_url_root = defined?(config.relative_url_root) && config.relative_url_root
  if relative_url_root
    source = File.join(relative_url_root, source) unless source.starts_with?(relative_url_root)
  end

  if host = compute_asset_host(source, options)
    source = File.join(host, source)
  end

  source.concat(tail)
end

asset_path_before.rb

def asset_path(source, options = {})
  source = source.to_s
  return "" unless source.present?
  return source if source =~ URI_REGEXP

  tail, source = source[/([\?#].+)$/], source.sub(/([\?#].+)$/, '')

  if extname = compute_asset_extname(source, options)
    source = "#{source}#{extname}"
  end

  if source[0] != ?/
    source = compute_asset_path(source, options)
  end

  relative_url_root = defined?(config.relative_url_root) && config.relative_url_root
  if relative_url_root
    source = File.join(relative_url_root, source) unless source.starts_with?("#{relative_url_root}/")
  end

  if host = compute_asset_host(source, options)
    source = File.join(host, source)
  end

  "#{source}#{tail}"
end

asset_path_test.rb

$:.unshift "#{File.dirname(__FILE__)}/lib"

require 'benchmark/ips'
require 'action_view'
require 'memory_profiler'

class Foo
  include ActionView::Helpers::AssetUrlHelper
  include ActionView::Helpers::AssetTagHelper
end

@foo = Foo.new

puts "=============== Before"
MemoryProfiler.report do
  @foo.asset_path_before("/application.txt?v=1111")
end.pretty_print

puts "=============== After"
MemoryProfiler.report do
  @foo.asset_path("/application.txt?v=1111")
end.pretty_print


# exit

Benchmark.ips do |x|
  x.report("asset_path before") {
    @foo.asset_path_before("application.js?v=1111")
  }

  x.report("asset_path after") {
    @foo.asset_path("application.js?v=1111")
  }
  x.compare!
end

result

## Before

Total allocated 13
Total retained 0

## After

Total allocated 4
Total retained 0

## Benchmark

Calculating -------------------------------------
   asset_path before      9350 i/100ms
    asset_path after     10956 i/100ms
-------------------------------------------------
   asset_path before   114269.7 (±6.0%) i/s -     579700 in   5.091220s
    asset_path after   137230.6 (±6.1%) i/s -     690228 in   5.048627s

Comparison:
    asset_path after:   137230.6 i/s
   asset_path before:   114269.7 i/s - 1.20x slower