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I've tested

http://nightly.mozilla.org/js-preview.html

with my simple benchmark loop (two floating point additions per pass) and it's really better:

300M passes of loop, time in seconds:

0.88 Firefox 4b6

2.26 Firefox 3.6.6

which is approximately 2.5 times faster.

Now that particular loop executes at the same speed as ActionScript 3 (in Flash 10) with explicit typing. That's the big achievement for Mozilla.

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Here's some more data from Mozilla's own testing setup:

http://arewefastyet.com/?machine=5

Where JM+TM stands for "Jagermonkey + Tracemonkey". It looks to be gaining on V8 and Apple Nitro pretty fast, considering the timeline involved.

Gotta love the domain name + favicon :-)

Also like the big "No." mid page.

The team seems to be pretty focused on getting to be faster than Chrome/Safari. Great idea to have a simple goal, and a simple answer to whether they have achieved it or not.

Looking at their v8 bench speedup: from 0.7 ms to around 0.3 ms we get again 2.3, comparable with the simple loop measurement. But interestingly enough, Google's V8 gets its speed in a very different way, as my mentioned benchmark loop performs much worse in Chrome: 3.9 sec on Chrome 6.0.472, thats 4.4 times slower than ActionScript or Firefox Beta 4.

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