In my dev sandbox
RAILS_ENV=production rake assets:precompile
is taking over 4 minutes to complete. Is this normal. On heroku it is taking over 10 minutes to do the job and sometimes is timing out. Is there any way to disect this and/or speed it up?
UPDATE
I profiled the CSS vs JS phases of compilation
3.7 s js
175 s css
The numbers were made by instrumenting here
----------------------
/Users/bradphelan/.rvm/gems/ruby-1.9.2-p180@gobbq/gems/sprockets-2.1.2/lib/sprockets/processing.rb
----------------------
266 # Assign a compressor to run on `application/javascript` assets.
267 #
268 # The compressor object must respond to `compress` or `compile`.
269 def js_compressor=(compressor)
270 expire_index!
271
272 unregister_bundle_processor 'application/javascript', :js_compressor
273 return unless compressor
274
275 register_bundle_processor 'application/javascript', :js_compressor do |context, data|
276
277 timeit "js" do
278 compressor.compress(data)
279 end
280
281 end
282 end
and
----------------------
/Users/bradphelan/.rvm/gems/ruby-1.9.2-p180@gobbq/gems/sprockets-2.1.2/lib/sprockets/processing.rb
----------------------
241
242 # Assign a compressor to run on `text/css` assets.
243 #
244 # The compressor object must respond to `compress` or `compile`.
245 def css_compressor=(compressor)
246 expire_index!
247
248 unregister_bundle_processor 'text/css', :css_compressor
249 return unless compressor
250
251 register_bundle_processor 'text/css', :css_compressor do |context, data|
252 timeit "css" do
253 compressor.compress(data)
254 end
255 end
256 end
The timeit call is the added bit doing the timing
def timeit context
s = Time.now
yield.tap do
e = Time.now
d = e - s
puts "#{d*1000}\t #{context}"
end
end
rake assets:precompile. We use rake assets:precompile to precompile our assets before pushing code to production. This command precompiles assets and places them under the public/assets directory in our Rails application.
The hackety hack solution seems to be to monkey patch the standard sass compression engine out of the way. I added this to the top of my application.rb
module Sass
module Rails
class CssCompressor
def compress(css)
css
end
end
end
end
The difference in file size was 124k before the monkey patch and 125k after and an order of magnitude speed improvement.
I am on Rails 3.2.13 - I had the same problem with css compression taking an extremely long time. To fix:
In Gemfile add:
gem 'yui-compressor'
In config/environments/production.rb:
config.assets.css_compressor = :yui
config.assets.js_compressor = :yui
rake assets:precompile without those changes: 325 seconds
rake assets:precompile with those changes: 79 seconds
rake assets:precompile with no compression: 45 seconds
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