Opera
Failed 0 tests.
Test 26 passed, but took 55ms (less than 30fps)
Total elapsed time: 0.60s
// test 26: check that document tree survives while still accessible
Chrome
Failed 0 tests.
Test 69 passed, but took 5 attempts (less than perfect)
Total elapsed time: 0.69s
// test 69: check that the support files loaded -- preparation for the rest of the tests in this bucket
Firefox
Failed 0 tests.
Test 26 passed, but took 36ms (less than 30fps)
Total elapsed time: 0.76s
// test 26: check that document tree survives while still accessible
As for the flash not updating, it automatically updates for me so I'm not sure what you're talking about.
The speed means practically nothing because it's barely visible unless you absolutely hate a page taking a few extra milliseconds to load. Even then, you'll likely be somewhat biased about it.
So in reality, the 3 mentioned browsers are all fine. I wouldn't be surprised that Google would pull stuff like this after they pretty much plaster "get a faster browser!" everywhere, just so they can collect information on you for their ads.
