Tightrope:I scored "awesome", passed all tests. Except the WGT meter.
I see that lied above, I actually never passed the "Ultra test". Interesting, in ways, is that Chrome, with Pepperflash, seem to be very good. It scored less than Opera and Firefox, but that seem to be because it apparently caps the fps at 60. It performs much better than the others on "heavy" and "ultra"
Opera (awesome)
Lite 73
Medium 66
Heavy 29
Ultra 15
Chrome (great)
Lite 60
Medium 60
Heavy 40
Ultra 19
Firefox (awesome)
Lite 72
Medium 67
Heavy 29
Ultra 14
In WGT, for me, the meter is smoothest by far with Chrome. Unfortunately I can not use it since it react very poorly to my click.