[Rails] Why is RSpec so slow with Rails 3?

I'm just learning my way through ruby and rails to learn it. One thing
I noticed is that testing 1 spec class with 1 test takes about 20
seconds. It's not even using any rails functionality at all. I am just
concatenating some strings together and doing some math...

Contrast this with JUnit or ScalaTest... and I could have ran an
entire suit of thousands of tests in this amount of time.

One of the reasons I hated grails (I played with it about a year ago)
was that tests ran rediculously slow, so the test/feedback cycle was
horrendous... and I just refused to put up with that.

People knock Java/Spring/Hibernate, but you can have a fully tiered,
database-driven app that populates 100-150 rows of data per test that
runs 1000+ tests in under 60 seconds.

Given that knowledge... 20 seconds for 1 test that does nothing seems
very, very wrong. Any way I can speed this up?

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