It probably means that the web browser's future is to be an awesome web browser.
And I am not quite sure how you cannot be impressed with this.
Virtualbox does not emulate anything, it uses the CPU's virtualization extensions and the code runs natively on the CPU.
Find out more at http://en.wikipedia.org/wiki/Rollover_%28key%29#n-key_rollov...
Mobile Safari will never run this right.
I can run multiple instances in parallel fullspeed on a shitty mac. If you don't have a GPU (or a blacklisted one), expect your browsers to run like shit.