It was made apparent to me that many ruby devs either aren’t aware or couldn’t be bothered to tweak their ruby garbage collector settings. Well, if you are using MRI, please start tweaking your GC settings. Here’s what I use (on my 15" Macbook Pro Retina): export RUBY_GC_MALLOC_LIMIT=90000000 export RUBY_FREE_MIN=200000 Not only can you tweak it for your local dev machine, you can also tweak Jenkins, Travis CI, Wercker and other CI solutions, making instant speed gain for your test sui...