Note: The "benchmark" piece should not be construed as an actual attempt at benchmarking ScreamingDonkey.
It's just a shiny new piece of code I decided to port to ScreamingDonkey to understand what could work on it.
There are a number of unresolved issues that make the numbers it outputs less than useful.
You have been warned.

Mozilla JavaScript performance test suite.
More information about Dromaeo can be found on the Mozilla wiki.