Why does Dolphin run faster on WinXP than on Win64

[themanuel]

(11-18-2013, 01:12 PM)KHg8m3r Wrote: It's good that you're looking for ways to improve, but some may be speedhacks that were removed.
It's good that you brought you Windows 7 up to were you like it.

Thank you and others for your help and support. The speed hacks would explain why recent versions are slower than older ones but the puzzling part is why the same version runs faster in one OS than the other.
Is there a performance penalty for running 32-bit applications in 64-bit systems?