Capistrano deploy and assets:precompile too slow - ruby-on-rails

Question

"rake assets:precompile" and "cap deploy" consume extremely high amount of time whenever I call it (usually more then an hour). Sometimes deploy hang at all.
I use Rails 3.2.13, Ruby 1.9.3, OSX and Backbone's Chaplin Framework for frontend.
How can I speed up assets precompile and deploy task and what can cause such freezing?
My deploy.rb config:
# -*- encoding : utf-8 -*-
require 'bundler/capistrano'
load 'deploy/assets'
set :application, "eyelashes"
set :rails_env, "production"
set :repository, "git#github.com:eyelasher/repo.git"
set :scm, :git
set :deploy_via, :checkout
set :ssh_options, { :forward_agent => true }
default_run_options[:pty] = true
server "75.223.145.3", :app, :web, :db, :primary => true
set :bundle_without, [:test]
set :user, 'deployer'
set :deploy_to, "/home/deployer/eyelasher"
set :branch, "master" unless exists?(:branch)
set :use_sudo, false
set :rvm_type, :user
set :rvm_ruby_string, :local
set :deploy_via, :checkout
before 'deploy:setup', 'rvm:create_gemset'
set :unicorn_conf, "#{deploy_to}/current/config/unicorn.rb"
set :unicorn_pid, "#{deploy_to}/shared/pids/unicorn.pid"
after "deploy", "deploy:migrate"
after "deploy", "deploy:cleanup"
require 'rvm/capistrano'
require 'thinking_sphinx/deploy/capistrano'
#after 'deploy:update_code', :roles => :app do
#run "rm -f #{current_release}/config/database.yml"
#run "ln -s #{deploy_to}/shared/config/database.yml #{current_release}/config/database.yml"
#end
namespace :deploy do
task :restart do
run "if [ -f #{unicorn_pid} ]; then kill -USR2 `cat #{unicorn_pid}`; else cd #{deploy_to}/current && bundle exec unicorn -c #{unicorn_conf} -E #{rails_env} -D; fi"
end
task :start do
run "cd #{deploy_to}/current && bundle exec unicorn -c #{unicorn_conf} -E #{rails_env} -D;"
end
task :stop do
run "if [ -f #{unicorn_pid} ] && [ -e /proc/$(cat #{unicorn_pid}) ]; then kill -QUIT `cat #{unicorn_pid}`; fi"
end
end
# Thinking Sphinx typing shortcuts
namespace :ts do
task :conf do
thinking_sphinx.configure
end
task :in do
thinking_sphinx.index
end
task :start do
thinking_sphinx.start
end
task :stop do
thinking_sphinx.stop
end
task :restart do
thinking_sphinx.restart
end
task :rebuild do
thinking_sphinx.rebuild
end
end
# http://github.com/jamis/capistrano/blob/master/lib/capistrano/recipes/deploy.rb
# :default -> update, restart
# :update -> update_code, symlink
namespace :deploy do
desc "Link up Sphinx's indexes."
task :symlink_sphinx_indexes, :roles => [:app] do
run "ln -nfs #{shared_path}/db/sphinx #{release_path}/db/sphinx"
end
task :activate_sphinx, :roles => [:app] do
symlink_sphinx_indexes
thinking_sphinx.configure
#thinking_sphinx.stop
#thinking_sphinx.start
end
task :copy_images do
run "cp -R #{shared_path}/public/images #{release_path}/public/images"
end
before 'deploy:update_code', 'thinking_sphinx:stop'
after 'deploy:update_code', 'deploy:activate_sphinx'
after 'deploy:update_code', 'deploy:copy_images'
end
Maybe I can speedup somehow by making changes in deploy configuration?

Answer 1

If you are deploying to a memory constrained VPS that sounds plausible. I'd recommend precompiling the assets on a a faster machine and checking them in to your repository.
There are various Gems and packages for speeding up asset precompilation by parallesing them, however in your situation that will likely make things MUCH worse!