Windows 10 vs. Windows 8.1 vs. Windows 7 Performance
 

Windows 10 is put to the test to find out how it fares compared to Windows 7 and Windows 8.1 in various aspects of the operating system including boot up and shutdown times, file copying, encoding, browsing, gaming and some synthetic benchmarks.

http://www.techspot.com/review/1042-...-vs-windows-7/