Why does Dolphin run faster on WinXP than on Win64

[themanuel]

(11-18-2013, 04:08 AM)KHg8m3r Wrote: Old versions are not officially supported by the forums, because issues that are present in old builds have been fixed. Can you test both OS's on the latest dev build of 4.0 x86? That will give a true idea of how well the two systems measure up.
Also, did you make sure that everything is up to date in windows 7? Check drivers, windows updates, directx web updater, and the latest updates to visual c++.

Even with your overclocking, that CPU is really weak in per-core performance. How long have you had it, and would it possible for you to get a higher Core 2 Duo/Quad CPU? You really need more strength

I downloaded the latest build for testing: dolphin-master-4.0-399-x86
In Windows 7, with either OGL or D3D (11), I get between 30-40 FPS in SCII, which is quite unplayable. In Windows XP, I can't launch Dolphin because I get a message: "this is not a valid Win32 application", even though it is the x86 build, so I can't test back-to-back.

Does it seem as though I should be getting more FPS with my Dual Core 3.0 GHz and GTS 250?
Would the card being Dx10 be causing an issue (even though OGL is as slow as D3D11)?

Sure, getting a faster processor would probably resolve this but then I wouldn't be posting. I'm just trying to understand if I could possibly have something set up sub-optimally in my system that is holding performance back.

I'll make sure I have my run-time libraries and drivers up to date.
In the meantime, if anybody can think of something I can check I'll appreciate your feedback.