Just to follow up on the recent discussion on the sensitivity for Sandstorm: https://forums.focus-home.com/topic/35629/mouse-sensitivity-drops-in-the-middle-of-the-freeaim-box
I just got back from reading dsogaming and Microsoft made an announcement; stating that the Windows 10 update can degrade mouse & graphics performance when playing desktop games (Sandstorm, for example). They mention that they are currently working on fixing issue with another OS update.
It a little off topic, I just want to give you a heads up.