On Nov 28, 2010, at 14:36 , David Chelimsky wrote:

>  * Performance improvments (see =
[Upgrade.markdown](https://github.com/rspec/rspec-core/blob/master/Upgrade=
.markdown))

from the Upgrade page:

> Made several small optimizations that all add up to a considerable =
improvement in performance. Using a simple benchmark:
>=20
> generate 5000 example groups,
> each with one example,
> each with one passing expectation

Unfortunately, this isn't enough of a benchmark. You really should to =
generate both the positive and negative cases as error handling often =
incurs a lot of extra overhead.=20

You can see my numbers for positive and negative (against rspec 2.0 and =
1.x, and a bunch of other test frameworks) here:

  http://www.zenspider.com/~ryan/report.1000.html