Finding out why a particular spec is slow might be tricky. Thanks to Aman Gupta, we have stackprof - a sampling call-stack profiler for ruby 2.1+. I have used it a lot while working on RubyBench and finding slow parts of code in Rails stack, but never in specs. Yesterday I had to find out why my RSpec example was slow and I wrote this snippet: {% highlight ruby %} spec/spec_helper.rb RSpec.configu