Speed up bundle install
TL;DR Next time, when you need bundle install, do bundle install --jobs X, where X is the number of your machine cores. It will save you huge amount of time.
Some blog suggests that setting the number of jobs to X-1 is statistically better than X. But that is not true anymore, at least with bundler >= 1.7.12. To prove this, I tested it on a large Rails project (discourse) on my Mid 2012 MBP with 2.6 GHz Intel Core i7. Below is my test result:
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