Woosh

I was looking through glow2’s commits, and I noticed references to Woosh, a JavaScript speed testing framework written by Jake Archibald. It’s being used in a similar way to slickspeed to test glow2’s performance.
Tests look like this:
woosh.addTests('testSomething',
'Test 1': new woosh.Test(timesToRun, function() {
return testFunction();
})
});
Frances Berriman (one of the glow authors) wrote a very detailed Woosh tutorial: JavaScript speed testing tutorial with Woosh.