Tested many times since my i7 4790K and now with my 8700k and Api overhead always better on windows 7 Link : Compare
Fraps benchmark Win 7 vs Win 10 PUBG : Win 10 : Min, Max, Avg 89, 139, 125.696 Win 7 : Min, Max, Avg 109, 144, 137.282 Tested at Yasnaya ultra settings really better on 7 system
Windows 7 sp1 for the win lol. 10 just drove me crazy the whole time I had it,Too many adds ect...Performance stand point 7 does feel alot smoother too me as well. If it ain't broke why fix it I say.
For sure : https://www.3dmark.com/aot/256555 tested with 388.71 - 390.77 - 397.31 the best is 390.77 in this test with RS4
Me too really smoother on pubg and some games ( gw2 , blade and soul ) , lower frames 15-20 in avg on bf1 but enough for 144hz ( playing incursion mod 1050p ).