Originally Posted by Haleth
As far as I'm aware, 64-bit applications are typically faster because large instructions don't have to be broken up seeing as there is more room in the registers.
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Yes, but just because a program has been compiled as 64-bit doesn't mean it is using 64-bit addresses. I think that is what SDPhantom was implying; unless WoW has been coded twice - once for 32-bit and once for 64-bit - there can't be much of a performance increase, just 64-bit registers holding 32-bit addresses.