Is the slug size normal? - ruby-on-rails-3

Question

I just started using Rails 3 on Heroku and was surprised at how much bigger the slug size (28MB) is compared to using Rails 2.3.5 on Heroku (less than 5MB). Is this normal? It's a simple application that only uses the reque, aasm, and unicorn gems. Everything else is the default.
source 'http://rubygems.org'
gem 'rails', '3.1.0.rc4'
gem 'pg'
# Asset template engines
gem 'sass-rails', "~> 3.1.0.rc"
gem 'coffee-script'
gem 'uglifier'
gem 'jquery-rails'
gem 'aasm'
gem 'resque'
# Use unicorn as the web server
gem 'unicorn'
group :production do
gem 'therubyracer-heroku', '0.8.1.pre3'
end
-----> Heroku receiving push
-----> Ruby/Rails app detected
-----> Installing dependencies using Bundler version 1.1.pre.5
Running: bundle install --without development:test --path vendor/bundle --deployment
Using rake (0.9.2)
Using aasm (2.2.0)
Using multi_json (1.0.3)
Using activesupport (3.1.0.rc4)
Using bcrypt-ruby (2.1.4)
Using builder (3.0.0)
Using i18n (0.6.0)
Using activemodel (3.1.0.rc4)
Using erubis (2.7.0)
Using rack (1.3.0)
Using rack-cache (1.0.2)
Using rack-mount (0.8.1)
Using rack-test (0.6.0)
Using hike (1.1.0)
Using tilt (1.3.2)
Using sprockets (2.0.0.beta.10)
Using tzinfo (0.3.29)
Using actionpack (3.1.0.rc4)
Using mime-types (1.16)
Using polyglot (0.3.1)
Using treetop (1.4.9)
Using mail (2.3.0)
Using actionmailer (3.1.0.rc4)
Using arel (2.1.3)
Using activerecord (3.1.0.rc4)
Using activeresource (3.1.0.rc4)
Using coffee-script-source (1.1.1)
Using execjs (1.2.0)
Using coffee-script (2.2.0)
Using rack-ssl (1.3.2)
Using rdoc (3.8)
Using thor (0.14.6)
Using railties (3.1.0.rc4)
Using jquery-rails (1.0.12)
Using json (1.5.3)
Using kgio (2.5.0)
Using pg (0.11.0)
Using bundler (1.1.pre.5)
Using rails (3.1.0.rc4)
Using raindrops (0.7.0)
Using redis (2.2.1)
Using redis-namespace (1.0.3)
Using sinatra (1.2.6)
Using vegas (0.1.8)
Using resque (1.17.1)
Using sass (3.1.4)
Using sass-rails (3.1.0.rc.4)
Using therubyracer-heroku (0.8.1.pre3)
Using uglifier (1.0.0)
Using unicorn (4.0.1)
Your bundle is complete! It was installed into ./vendor/bundle
Cleaning up the bundler cache.
-----> Creating ERB based database.yml
-----> Rails plugin injection
Injecting rails_log_stdout
Injecting rails3_serve_static_assets
-----> Preparing app for Rails asset pipeline
-----> Discovering process types
Procfile declares types -> web, worker
Default types for Ruby/Rails -> console, rake
-----> Compiled slug size is 28.3MB
-----> Launching... done, v59

Answer 1

yes, it's perfectly fine. Especially since it's Rails 3.1 since it has dependency on a few large gems like rubyracer etc.