Ruby 2.0 speedups on our test suite (mix of capybara integration, ActiveRecord model, controller, and unit tests). 10.1 s wall time is a nice improvement!

results

# ruby 1.9.3-p327
% time .bin/rake spec
Finished in 32.2 seconds
294 examples, 0 failures

Randomized with seed 28895

real        48.81
user        39.52
sys          2.78

# ruby 2.0.0-p0
% time .bin/rake spec
Finished in 26.71 seconds
294 examples, 0 failures

Randomized with seed 64357

real        38.71
user        31.56
sys          2.60