Spec times vs Rails initialisation times

gistfile1.txt

# ruby 1.9.3
# rails (3.2.15)

$ time rspec spec/lib/label_as_csv_spec.rb 
..........................

Finished in 0.38397 seconds
26 examples, 0 failures

Randomized with seed 17361

real	0m8.349s
user	0m7.301s
sys	0m1.015s

specs: 0.3 seconds
total: 8.3 seconds!

gistfile2.txt

# ruby 2.0.0
# gem 'rails', '4.0.1'

$ time rspec spec/lib/message_publisher_spec.rb 
......

Finished in 0.02812 seconds
6 examples, 0 failures

Randomized with seed 5269

real	0m3.024s
user	0m2.353s
sys	0m0.642s

gistfile3.txt

# ruby 2.0.0
# gem 'rails', '3.2.13'

$ time bundle exec rspec spec/helpers/entries_helper_spec.rb 
...

Finished in 0.03195 seconds
3 examples, 0 failures

Randomized with seed 53715


real	0m2.044s
user	0m1.673s
sys	0m0.358s

gistfile4.txt

# ruby 1.9.2
# gem 'rails', '3.2.13'

$ time rspec spec/helpers/application_helper_spec.rb 
........

Finished in 0.55823 seconds
8 examples, 0 failures

real	0m9.180s
user	0m7.737s
sys	0m1.356s