Capistrano very slow - ruby-on-rails

Question

I am not sure where exactly the problem is located but Capistrano takes about 5 minutes to deploy an almost empty project.
Can you tell me if I am doing something wrong or is it usual?
I am using:
Capistrano 2.9.0
Rails 3.1.3
Github Repository
not too slow server (4 cores, 1 GB memory)
ngix, passenger
Here is the output I am getting:
https://gist.github.com/1632009
Capfile
load 'deploy' if respond_to?(:namespace) # cap2 differentiator
# Uncomment if you are using Rails' asset pipeline
load 'deploy/assets'
Dir['vendor/gems/*/recipes/*.rb','vendor/plugins/*/recipes/*.rb'].each { |plugin| load(plugin) }
load 'config/deploy' # remove this line to skip loading any of the default tasks
deploy.rb
# -*- encoding : utf-8 -*-
require "bundler/capistrano"
set :user, 'rubys'
set :domain, 'example.com'
set :application, 'EXAMPLE'
# adjust if you are using RVM, remove if you are not
$:.unshift(File.expand_path('./lib', ENV['rvm_path']))
require "rvm/capistrano"
set :rvm_ruby_string, '1.9.2'
#set :rvm_type, :user
# file paths
set :repository, "git#github.com:GITHUBREPO/ashop.git"
set :deploy_to, "/apps/#{application}"
# using a local git repository on the server you are deploying to.
set :deploy_via, :remote_cache
set :copy_exclude, [ '.git' ]
# distribute your applications across servers (the instructions below put them
# all on the same server, defined above as 'domain', adjust as necessary)
role :app, domain
role :web, domain
role :db, domain, :primary => true
set :deploy_via, :remote_cache
set :scm, 'git'
set :branch, 'master'
set :scm_verbose, false
set :use_sudo, false
set :rails_env, :production
namespace :deploy do
desc "cause Passenger to initiate a restart"
task :restart do
run "touch #{current_path}/tmp/restart.txt"
end
end
EDIT
Networkspeed workplace:
http://www.speedtest.net/result/1714391142.png
Speed Github - Server: ~ 300KiB

Answer 1

Capistrano is probably slow for a bunch of reasons. One is that it opens a new remote shell to your server for every run in your deploy.rb file.
This can be amended a bit by using ssh master channels, which will cause capistrano to actually reuse ssh connections, which means less network overhead.
Here's an article on ruby deployment that mentions ssh master channels: http://alexyoung.org/2011/05/17/deployment/
Another reason is that it copies your entire codebase to a new directory for every deploy.
This is not strictly necessary when using git, and github has a wonderful article on how to "fix" this: https://github.com/blog/470-deployment-script-spring-cleaning