Small option, but took me 2 hours to find
This will automatically generate reports for your test-runs.

It only shows single examples, which is sad since i would also want to know which controller_specs take the longest…

Output:

Top 10 slowest examples:
0.5215740 User downgrades to a person
0.4326950 User finds invalid
0.1914630 User remembering unsets remember token
0.1218360 User is valid
0.0903790 Festival is valid

Install:

#spec/spec.opts
--format profile:spec/profile.txt