Timed Specs

A Rspec formatter built upon the default DocumentationFormatter which shows the time taken for each example along with the other information shown by the DocumentationFormatter. You also have the option to list the slowest 'n' examples at the end.

gem install timed_specs

Or

gem 'timed_specs'

bundle exec rspec -f TimedSpecs --colour spec/

Or, even easier, add this to your .rspec file:

-- colour
-f TimedSpecs

To run the tests:

$ bundle exec rspec spec/