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 with and without Spring. The Spring results will skip many files because of eager loading; SimpleCov doesn't get loaded . . .
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 . . .