If you want to optimize for speed, I'd recommend using Nokogiri, but not the Nokogiri::XML::Builder which will perform about as well as the Builder gem. Instead, use the lower-level Document and Node APIs. Here's some code showing equivalent document construction for Builder, Nokogiri::XML::Builder, and Nokogiri::XML::Document ... and a benchmark if it's helpful (higher numbers are better, it's iterations per second): ```ruby #! /usr/bin/env ruby require "bundler/inline" gemfile do source "https://rubygems.org" gem "builder" gem "nokogiri" gem "benchmark-ips" end require "builder" require "nokogiri" require "benchmark/ips" N = 100 # using Builder::XmlMarkup, build an XML document representing attributes of a person def builder_person xml = Builder::XmlMarkup.new xml.people do |p| N.times do xml.person do |p| p.name "John Doe" p.age 42 p.address do |a| a.street "123 Main Street" a.city "Anytown" end end end end end # using Nokogiri::XML::Builder, build an XML document representing attributes of a person def nokogiri_person Nokogiri::XML::Builder.new do |xml| xml.people do N.times do xml.person do |p| p.name "John Doe" p.age 42 p.address do |a| a.street "123 Main Street" a.city "Anytown" end end end end end.to_xml end # use Nokogiri's bare API to build an XML document representing attributes of a person def nokogiri_raw_person xml = Nokogiri::XML::Document.new xml.root = xml.create_element("people") N.times do xml.root.add_child(xml.create_element("person")).tap do |p| p.add_child(xml.create_element("name", "John Doe")) p.add_child(xml.create_element("age", 42)) p.add_child(xml.create_element("address")).tap do |a| a.add_child(xml.create_element("street", "123 Main Street")) a.add_child(xml.create_element("city", "Anytown")) end end end xml.to_xml end puts RUBY_DESCRIPTION # pp builder_person # pp nokogiri_person # pp nokogiri_raw_person Benchmark.ips do |x| x.report("builder") { builder_person } x.report("nokogiri") { nokogiri_person } x.report("nokogiri raw") { nokogiri_raw_person } x.compare! end ``` ``` ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x86_64-linux] Warming up -------------------------------------- builder 58.000 i/100ms nokogiri 49.000 i/100ms nokogiri raw 61.000 i/100ms Calculating ------------------------------------- builder 541.580 (± 6.5%) i/s - 2.726k in 5.054535s nokogiri 451.127 (± 7.5%) i/s - 2.254k in 5.027192s nokogiri raw 681.437 (± 9.1%) i/s - 3.416k in 5.061582s Comparison: nokogiri raw: 681.4 i/s builder: 541.6 i/s - 1.26x slower nokogiri: 451.1 i/s - 1.51x slower ``` On Thu, May 18, 2023 at 8:02 AM Austin Ziegler via ruby-talk < ruby-talk@ml.ruby-lang.org> wrote:

I have never used the Rails builder interface for JSON or XML generation. It’s nice because it’s DSL-ish, but it needs to be executed.

If your data can be templated, using ERB will be better. If it is more complex with attributes, look into restructuring it so that you can use Nokogiri. I’m not sure if Ox generates as well as parses, but it may also be an option.

-a

...

On May 18, 2023, at 04:25, Peter Hickman via ruby-talk < ruby-talk@ml.ruby-lang.org> wrote:

 I'm profiling some code to try and squeeze out performance. It takes a user query, reads data from the database and returned the result as XML

I have tuned the code and database (checking the indexes, caching repeated calls etc) and what I am left with is that 95% of the call's runtime is building the XML. We are using builder because it is the standard / default for Ruby

Using Ruby 3.0.2p107 as it is the default for Ubuntu 22.04

Is there another, faster library for XML generation or will I be building this by hand?

Any suggestions

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