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gist: 18533 Download_button fork
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benchmark.rb #
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#!/usr/bin/env ruby
require 'rubygems'
require 'open-uri'
require 'hpricot'
require 'nokogiri'
require 'benchmark'
 
uri = URI.parse('http://static.bezurk.com/fragments/wikitravel/sin.xml')
content = uri.read
 
N = 1000
 
Benchmark.bm do |x|
  x.report('hpricot:doc') do
    N.times do
      Hpricot.XML(content)
    end
  end
 
  x.report('nokogiri:doc') do
    N.times do
      Nokogiri::XML(content)
    end
  end
end
 
Benchmark.bm do |x|
  x.report('hpricot:xpath') do
    N.times do
      doc = Hpricot.XML(content)
      info = doc.search('//location/info').first.inner_text
      url = doc.search('//location/refUrl').first.inner_text
    end
  end
 
  x.report('nokogiri:xpath') do
    N.times do
      doc = Nokogiri::XML(content)
      info = doc.xpath('//location/info').first.inner_text
      url = doc.xpath('//location/refUrl').first.inner_text
    end
  end
end
 
Benchmark.bm do |x|
  x.report('hpricot:css') do
    N.times do
      doc = Hpricot.XML(content)
      info = doc.search('location info').first.inner_text
      url = doc.search('location refUrl').first.inner_text
    end
  end
 
  x.report('nokogiri:css') do
    N.times do
      doc = Nokogiri::XML(content)
      info = doc.search('location info').first.inner_text
      url = doc.search('location refUrl').first.inner_text
    end
  end
end
Result #
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$ ./hpricot_vs_nokogiri.rb 

      user     system      total        real

hpricot:doc  0.230000   0.010000   0.240000 (  0.265904)

nokogiri:doc  0.030000   0.010000   0.040000 (  0.041641)

      user     system      total        real

hpricot:xpath  1.050000   0.020000   1.070000 (  1.114454)

nokogiri:xpath  0.210000   0.010000   0.220000 (  0.226418)

      user     system      total        real

hpricot:css  1.140000   0.030000   1.170000 (  1.339635)

nokogiri:css  0.700000   0.010000   0.710000 (  0.835559)
Summary #
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Use Nokogiri's XPath selectors for fastest speed - CSS-based search is faster than Hpricot but not as fast.

 
Also take note that this benchmark is only shows parsing of XML (not HTML).