A computer that came with XP (let's say prior to 2006? 2005?) will probably still run faster with XP (though XP is literally 12 years old now..). However, from what I understand a computer that came with Vista will run faster with Windows 7, and faster still with Windows 8.
Vista upped system requirements from XP, but since then, MS has lowered system requirements and OS footprint on each release.
Remember though that there are PCs that were genuinely quite good (back then) which came with XP and then could also easily run Vista. This is sort of what I was trying to get at with the 2005/2006 limit. Meaning that some PCs that came with XP might still be able to run faster with Win7/8. Just don't count on it if you got it in 2001 :)
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A computer that came with XP (let's say prior to 2006? 2005?) will probably still run faster with XP (though XP is literally 12 years old now..). However, from what I understand a computer that came with Vista will run faster with Windows 7, and faster still with Windows 8.
Vista upped system requirements from XP, but since then, MS has lowered system requirements and OS footprint on each release.
Remember though that there are PCs that were genuinely quite good (back then) which came with XP and then could also easily run Vista. This is sort of what I was trying to get at with the 2005/2006 limit. Meaning that some PCs that came with XP might still be able to run faster with Win7/8. Just don't count on it if you got it in 2001 :)