Google posted a modified version of SunSpider and the latest version of Kraken to make it easy to run the benchmarks in your own browser and compare results.
"To make the benchmark more meaningful, we've experimented by making the race longer by running each of the tests in SunSpider 50 times consecutively. While repeating a trivial test many times isn't a great solution, it does provide an opportunity for some optimization. With this change, the results begin to reflect Chrome's true performance. It's more than 30% faster on the SunSpider suite overall and up to 4x faster on some of the individual tests.
Kraken, a more modern benchmark, is in better shape. Unfortunately, the canonical version of the benchmark hasn't been updated to reflect all the latest changes which address at least one important bug. As a result, the benchmark is less useful and has even (mis)led us to spend time making some irrelevant optimizations in Chrome. To help us focus on the right things, we're now testing the latest version of Kraken built directly from Mozilla's source code repository," Google stated.
[Source: Chrominum blog]