Want to achieve spring-ified bliss for your rails-rspec-guard setup? Read on.
Spring, the app preloader that's integrated with Rails 4.1+, and SimpleCov, everyone's favorite test coverage analyzer don't seem to play nice. The symptoms are differing results when you run rspec one-off versus when you run it using Spring. The Spring results will skip many files because of eager loading; SimpleCov . . .
The tale of a hosting migration that shaved 40% off response times
We had a positive experience moving Cult Cosmetics, a rails app, from Heroku to OpsWorks, with response times reduced by ~40%. If you're thinking about making this move, DO IT, but realize that it will probably require more time & effort than you expected.
Why ditch Heroku?
I'm sure everyone has their own reasons, but here . . .