Well than i have 13 fujitsu machines core2 e5500 3.0ghz with 2gb ddr3, they came with win10, they were sluggihs and hald of good old games didnt work on it or were lagging like hell, after i reverted them all to windows 7 they were reborn and everything works just fine, i even tested CS:Source with 8 machines ( 4 using win 7 , 4 using win10 ) i used benchmark inside the game and the results were constant, with windows 7 giving 6 fps more (42 avg).