title: Rails: Performance benchmarking using RSPec
body: <p>I'm just coming across to RSpec from rake:test, and I'm struggling to find any equivalent to rake test:benchmark and/or rake test:profile.</p>
  
  <p>So, what do most rspec folks use for performance testing? I've found --profile, which spits back the ten slowest tests, but I was hoping for something a little more comprehensive.</p>
  
  <p>Cheers...</p>