MCO 628, and I noted downgrading the gfx drivers since I run an nvidia card, but it's not something I intend to do (a current game I am playing has been nitpicky about drivers before, and I don't know if next incoming patch for it will demand it).
Win10 64-bit, I have also tried setting compatibility to Win XP SP3 / 7, disable scaling on high DPI but neither work.
I guess for the time being, if there's no solution besides driver downgrade, I can probably make do playing this on an obsolete laptop with Intelgrated graphics; still laggy there but think it's tolerable provided there isn't intense action on-screen.