Compare with Assets precompile Guide I found this:
in your config/enviroments/production.rb
config.assets.compress = false
in the guide it is:
# Compress JavaScripts and CSS
config.assets.compress = true
# Choose the compressors to use
# config.assets.js_compressor = :uglifier
# config.assets.css_compressor = :yui
# Don't fallback to assets pipeline if a precompiled asset is missed
config.assets.compile = false
# Generate digests for assets URLs.
config.assets.digest = true
# Precompile additional assets (application.js, application.css, and all non-JS/CSS are already added)
# config.assets.precompile += %w( search.js )
If you are doing local compilation, look up here for do it and after that run local compilation $ RAILS_ENV=production bundle exec rake assets:precompile