Windows 10 vs. Windows 8.1 vs. Windows 7 Performance
Page 5 : Encoding PerformanceBy
Windows 10 delivered similar performance to Windows 7 in our HandBrake encoding test while 8.1 was noticeably faster than both.
Our Hybrid 4K benchmark saw almost no difference in performance between the three operating systems, though again Windows 10 matched 7 while 8.1 was a fraction faster.
Yet again we see that Windows 10 matched Windows 7 while it was slightly slower than 8.1 -- I emphasize slightly.