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sprockets-rails-parallel is a dirty monkeypatchy hack to make sprockets-rails use many processes when precompiling assets. It uses zmq, so you'll need that.


Add the gem to your gemfile and then in your config/application.rb or one of your environment files, add the following lines:

config.assets.parallel_precompile = true
config.assets.precompile_workers = Integer `sysctl -n hw.ncpu 2>/dev/null` rescue 1 # or something like this