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That could just be the driver used. As older OS's will by default use older drivers.
Unlikely. The drivers are currently up-to-date for both 7 and 8 yet 7 performs better. 8 will flounder with FFXI even on integrated graphics.
I've also heard that FFXI runs better on ATI/AMD cards than Nvidia generally, likely as a result of ATI having been the big thing in the early 2000s.
Here's some testing I've done to think over:
Laptop with:
i3 3110M, 2.4GHz, 4GB RAM, Intel HD 4000, Windows 8.1 - Settings have to be lowered to get a good framerate at 1366x768 (the laptop's resolution), but it runs FFXI pretty good (15-18FPS at high demand parts, 25+ otherwise generally)
i5 4200H, 2.8GHz, 8GB RAM, Intel HD 4600 (it runs with no difference on my nVidia GeForce GTX 860M) Windows 8.1 - Runs like crap at any resolution or setting. Lucky to see 15FPS just idling in an empty map.
With the above computer on Windows 7, though: Perfect 29.4FPS regularly, with rare drops to 25-28 if things are getting a bit intense.
To anyone having a problem with FFXI and you happen to use Windows 8 (any kind), please install Windows 7 as a dual-boot. You have 30 days to try stuff on Windows 7 before it pesters you for an activation key so you have plenty of time to test FFXI on it.
I don't think graphics cards (either integrated or dedicated) are at fault for most FFXI problems. I'm pretty sure the issue is Win8's poor support for pre-DX10. I've seen reports of DirectX 9 games having issues with Windows 8. FFXI uses DX8 which I've seen far too many reports of slowdown and general screwiness on Win8.
Some games have patches for Windows 8(.1) to help with poor DirectX/Direct3D/DirectDraw compatibility. I wonder if anything similar can be made for FFXI?
Just remember, a problem with FFXI being slow or something will basically never be your computer being too weak. It was designed to run on computers many times weaker as a result of being an old game, and I don't think it's required specs have changed over the years.