How can I avoid Windows 10?

I’m asking because it’s strange if you see any change at all. Because for something to run better on win 10 because of DX12, it has to be using the API. No game has yet been released where they have used DX12 API and an OS running DX12 doesn’t affect any DX11 and lower programs. I think there’s a long long way until we actually get to see that ~50% boost in action.