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It probably matters a lot more to have a decent computer. calibre runs just fine on Windows 7 & 8, but grinds to a near halt on an XP computer at my house -- AS DOES EVERYTHING ELSE!
If your computer is old and slow in general, that is the real problem.
If, on the other hand, your computer is new or at least fast, and calibre is inexplicably slow, then something is wrong, and using a different OS is not entirely likely to fix anything.
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