capybara with :js => true very slow - ruby-on-rails

Question

when I toggle :js => true on my examples, takes too long very long to come up and run the first test, then becomes acceptable peformance
this sample running in 0.36722 seconds without :js, and 58.15 seconds with :js => true
require 'spec_helper'
include UserAbilitiesHelper
describe "Customer Task Pages" do
subject { page }
describe "side panel with the history of the tasks related to customer" do
before do
visit root_path()
end
it { sould have_content(I18n.t("customers.tasks.side.title")) }
end
describe "side panel with the history of the tasks related to customer" do
before do
visit root_path()
end
it { sould have_content(I18n.t("customers.tasks.side.title")) }
end
end
my Gemfile
source 'https://rubygems.org'
gem 'rails', '3.2.5'
gem 'pg', '0.12.2'
gem "meta_search"
# Bootstrap and layouting
gem 'bootstrap-sass', '2.0.3'
gem 'will_paginate', '3.0.3'
gem 'bootstrap-will_paginate', '0.0.6'
gem 'rails3-jquery-autocomplete'
#test support
gem 'faker', '1.0.1'
#login rules
gem 'devise'
gem 'cancan'
#criptar
gem 'bcrypt-ruby', '3.0.1'
#BR
gem 'brazilian-rails'
gem 'rails-i18n'
group :development do
gem 'annotate', '~> 2.4.1.beta'
gem 'nested_scaffold'
end
group :development, :test do
gem 'rspec-rails', '2.10.0'
gem 'guard-rspec', '0.5.5'
gem 'guard-spork', '0.3.2'
gem 'spork', '0.9.0'
gem 'ruby-debug19'
gem 'linecache19'
gem 'factory_girl_rails', '1.4.0'
end
# Gems used only for assets and not required
# in production environments by default.
group :assets do
gem 'sass-rails', '3.2.4'
gem 'coffee-rails', '3.2.2'
gem 'uglifier', '1.2.3'
end
gem 'jquery-rails', '2.0.0'
group :test do
gem 'capybara', '1.1.2'
gem "launchy"
gem 'ZenTest'
#MAC OS Especific
gem 'rb-fsevent', '0.4.3.1', :require => false
gem 'growl', '1.0.3'
#Cucumber
gem 'cucumber-rails', '1.2.1', require: false
gem 'database_cleaner', '0.7.0'
end
group :production do
#gem 'pg', '0.12.2'
end
running with
bundle exec rspec
An example any
Bruno-Guerras-MacBook-Pro:railstutorial brunoguerra$ bundle exec rspec spec/requests/authentication_pages_spec.rb
No DRb server is running. Running in local process instead ...
WARNING: Nokogiri was built against LibXML version 2.7.8, but has dynamically loaded 2.7.3
.....................
Finished in 6.07 seconds
21 examples, 0 failures
Bruno-Guerras-MacBook-Pro:railstutorial brunoguerra$ bundle exec rspec spec/requests/authentication_pages_spec.rb
No DRb server is running. Running in local process instead ...
WARNING: Nokogiri was built against LibXML version 2.7.8, but has dynamically loaded 2.7.3
............F........
Failures:
1) Authentication authorization for non-signed-in users when attempting to visit a protected page after signing in should render the desired protected page
Failure/Error: page.should have_selector('title', text: 'Edit user')
expected css "title" with text "Edit user" to return something
# ./spec/requests/authentication_pages_spec.rb:65:in `block (6 levels) in <top (required)>'
Finished in 1 minute 14.18 seconds
21 examples, 1 failure
Failed examples:
rspec ./spec/requests/authentication_pages_spec.rb:64 # Authentication authorization for non-signed-in users when attempting to visit a protected page after signing in should render the desired protected page
Bruno-Guerras-MacBook-Pro:railstutorial brunoguerra$
thanks

Answer 1

I discovery, my dns server is too slow, I changed my dns server and the problem solved, another thing I did to improve the speed of testing was to configure these parameters webrick
configure webrik speedup but, its solve the same problem, DNS server! urgh!!!

Answer 2

You can also try changing the driver :webkit_debug and then rerun your specs to see any if there are any scripts that don't need to be loaded on the page.
Capybara.javascript_driver = :webkit_debug
Then add any urls to the black list
config.before(:each, js: true) do
page.driver.browser.url_blacklist = ["http://use.typekit.net"]
end