So I clean installed once again (this time from the settings) and as last time I fixed everything and it run better than previous Win 10 but still not as good as before even though I had SLI enabled. So I got mad because I spent some time utilizing for the best performance. Keep in mind that I was using SLI (I didn’t use SLI before), and no SLI is NOT the cause.
Again I had issues with high disc usage that I fixed but when I launched a simple game Binding of Isaac it lagged REALLY hard. But then after some time a lot of errors and blue screens appeared and I got sick of them than I clean installed Win 10. I fixed all the issues with the high Disc usage (I disabled some services) and so it was running the same as 8.1 (which I’m not complaining).
So I upgraded my PC () from 8.1 to win 10.