>No you haven't.
In my top post I said:
> Other than the fact that amd64 provides more GPRs?
You should read what you're replying to.
> Also, 32-bits apps running on top of 64-bits are running in an emulated 32-bits environment
That's bullshit, at least on AMD64. "Because the full 32-bit instruction set remains implemented in hardware without any intervening emulation, existing 32-bit x86 executables run with no compatibility or performance penalties" [0]
> but modern browsers would get a healthy boost in performance
Have you tested this?