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Now that Windows 7 has RTMed and companies have had some time to refine their drivers, Windows 7 benchmarks will become a more accurate representation of its true performance. ZDNet seems to be the first to put out benchmarks comparing Windows 7, Vista SP2, and XP SP3. They’ve put three machines together with one in the mobile, low-range, and high-range category. The 64-bit edition of the operating systems are being used and they are all updated with the latest service pack.
For the most part, Windows 7 outperforms its predecessors significantly. Startup and shutdown times are generally faster at a noticeable margin. PCMark Vantage scores produced similar results with Windows 7 beating Vista in all aspects except for games on the “mobile” setup in the games category. Superfetch now starts much later than in Vista after startup to reduce stress on the hard-drive just after startup. Superfetch also uses less cache than in Vista. All-in-all, Windows 7 performs better than its predecessors but improvements on high-end setups are much more significant than on the low-end setups. ZDNet says that “…the low-end Intel Atom-based system is not really suitable for Windows 7. High-end systems with quad-core processors also benefit from Windows 7, because many of the operating system functions exploit the computing power of multi-core chips.”
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Read ZDNet’s full Windows 7 Benchmark comparison
here