Poor time performance of 'rake assets:precompile'

Question

Running:

bundle exec rake assets:precompile RAILS_ENV=production

Takes about 6 minutes for 15 .js files of about 250kb total. It should not take this long surely? I see the 'Microsoft Console Based Script Host' working flat out for most of this time.

What would people recommend / know is possible? Is there a way to replace this with Ruby-Racer or another javascript V8 engine implementation? OR to find out the problem in my code that's causing the long time? Or something else?

Aneurysm

Answer 1

Which server are you running? Is it Ubuntu, Debian, Mac? Make sure you have this in your Gemfile:

group :production do
  gem "libv8"
  gem "therubyracer", :require => 'v8'
end

See this page for more info: https://github.com/rails/rails/issues/2537

You can also try to remove unused files in your app/assets/* folders. Time is most spent on JS compilation.

Manizales

How do I find the unused files in my app/assets folders? For example, how do I know which are unused jquery components, or ckeditor components? – Serle

You have to analyze the application and identify the assets which are no longer relevant. And if possible, remove them so that they no longer contribute to the assets compilation. – Monocyte