On my Xoom with stock ICS 4.0.3, Chrome is on the whole dead even with the stock browser:

    Chrome - 2276.2ms +/- 1.0%
    Stock - 2288.9ms +/- 2.0%

Here's a screenshot of the detailed breakdown: http://i.imgur.com/WA37A.png . The "FROM" column is Chrome, the "TO" column is stock. Some tests Chrome wins, some stock.

Anandtech did a Sunspider comparison with Chrome slightly trailing stock and both somewhat behind Firefox 10. Not really gamebreaking differences though.

http://images.anandtech.com/graphs/graph5517/43983.png

I use Firefox Home on iOS for the sync even though the JS is gimped in non-Safari webkit views. Sync is that killer.

He updated with a test on a Galaxy Nexus (which is a TI OMAP chipset rather than a Tegra2) and Chrome did better than stock, but still behind Firefox.

Though to be honest I'm not sure why Anandtech continue to use Sunspider as a benchmark.

I believe that both browsers are based on WebKit and V8 (that's what they've said about the stock browser in the past, anyway), so your results aren't too surprising. The Chrome app adds a bunch of new features, better UI, and makes the browser into a real, bona fide app.

That's my read on it, anyway.

ICS on Nexus S.

  Browser - 4432.6 ms
  Chrome  - 3258.4 ms

EDIT: Didn't reboot or anything like that.

Html5test.com scores? I've got a new android phone but it won't run chrome.

256+3 bonus on stock, 343+10 bonus on Chrome.

I don't know how to paste which tests pass and which fail, is there any?

Opera Mobile 11.5 is 286 + 8 fwiw. Dolphin Mini 216 + 0.