how to get my rexml/nokogiri script run faster - ruby

Question

I have this ruby script that collects 46344 xml-links and then collects 16 elements-nodes in every xml file. The last part of the proccess is that it stores it in a CSV file. The problem that I have is that it takes to long. It takes more than 1-2 hour..
Here is the script without the link that have all the XML-links, I cant provid the link beacuse its company stuff.. I hope its cool.
Here is the script, and it works but it takes to long:
require 'rubygems'
require 'nokogiri'
require 'open-uri'
require 'rexml/document'
require 'csv'
include REXML
#urls = Array.new
#ID = Array.new
#titleSv = Array.new
#titleEn = Array.new
#identifier = Array.new
#typeOfLevel = Array.new
#typeOfResponsibleBody = Array.new
#courseTyp = Array.new
#credits = Array.new
#degree = Array.new
#preAcademic = Array.new
#subjectCodeVhs = Array.new
#descriptionSv = Array.new
#visibleToSweApplicants = Array.new
#lastedited = Array.new
#expires = Array.new
# Hämtar alla XML-länkar
htmldoc = Nokogiri::HTML(open('A SITE THAT HAVE ALL THE LINKS'))
# Hämtar alla länkar för xml-filerna och sparar dom i arrayn urls
htmldoc.xpath('//a/#href').each do |links|
#urls << links.content
end
#urls.each do |url|
# Loop throw the XML files and grab element nodes
xmldoc = REXML::Document.new(open(url).read)
# Root element
root = xmldoc.root
# Hämtar info-id
#ID << root.attributes["id"]
# TitleSv
xmldoc.elements.each("/ns:educationInfo/ns:titles/ns:title[1]"){
|e| #titleSv << e.text
}
# TitleEn
xmldoc.elements.each("/ns:educationInfo/ns:titles/ns:title[2]"){
|e| #titleEn << e.text
}
# Identifier
xmldoc.elements.each("/ns:educationInfo/ns:identifier"){
|e| #identifier << e.text
}
# typeOfLevel
xmldoc.elements.each("/ns:educationInfo/ns:educationLevelDetails/ns:typeOfLevel"){
|e| #typeOfLevel << e.text
}
# typeOfResponsibleBody
xmldoc.elements.each("/ns:educationInfo/ns:educationLevelDetails/ns:typeOfResponsibleBody"){
|e| #typeOfResponsibleBody << e.text
}
# courseTyp
xmldoc.elements.each("/ns:educationInfo/ns:educationLevelDetails/ns:academic/ns:courseOfferingPackage/ns:type"){
|e| #courseTyp << e.text
}
# credits
xmldoc.elements.each("/ns:educationInfo/ns:credits/ns:exact"){
|e| #credits << e.text
}
# degree
xmldoc.elements.each("/ns:educationInfo/ns:degrees/ns:degree"){
|e| #degree << e.text
}
# #preAcademic
xmldoc.elements.each("/ns:educationInfo/ns:prerequisites/ns:academic"){
|e| #preAcademic << e.text
}
# #subjectCodeVhs
xmldoc.elements.each("/ns:educationInfo/ns:subjects/ns:subject/ns:code"){
|e| #subjectCodeVhs << e.text
}
# DescriptionSv
xmldoc.elements.each("/educationInfo/descriptions/ct:description/ct:text"){
|e| #descriptionSv << e.text
}
# Hämtar dokuments utgångs-datum
#expires << root.attributes["expires"]
# Hämtar dokuments lastedited
#lastedited << root.attributes["lastEdited"]
# Lagrar dom i uni.CSV
CSV.open("eduction_normal.csv", "wb") do |row|
(0..#ID.length - 1).each do |index|
row << [#ID[index], #titleSv[index], #titleEn[index], #identifier[index], #typeOfLevel[index], #typeOfResponsibleBody[index], #courseTyp[index], #credits[index], #degree[index], #preAcademic[index], #subjectCodeVhs[index], #descriptionSv[index], #lastedited[index], #expires[index]]
end
end
end

Answer 1

If it's network access you could start threading it and/or start using Jruby which can use all cores on your processor. If you have to do it often you will have to work out a read write strategy that serves you best without blocking.