I had this game in my library and just downloaded it to play. I read on the Store Page where people were giving it 1 STAR due to the extreme lag making it near unplayable. I experienced the same and came on the forum, looking for a solution.
Known Issues and Workarounds mentioned VSync causing slow down of the game. Yeah, you could say that. Most people complain about lag on their controls that I would never notice. But this?? I would move my mouse and could visually see it stay for a half second before moving. No dang way I would torture myself with that!
Your turning off of Vsync solution SOLVED this. Thank you!!! (I did turn mouse sensitivity down to 1 quarter as well, before I even came to the forum and found that mouse sensitivity turned down was also a thing)
EDIT: Err, maybe I spoke to soon. I only used it in the main menu and got great results. There seems to be a difference when you actually play the game. And people suggest turning Mouse Sensitivity UP. There is a post below about Mouse Issues that goes way into depth about it and its actually not even a VSync issue. VSync being disabled is a work around, but not the cause. I suggest reading the other post. There are links there that are supposed to help with a DLL file that forces the mouse to work a little better.
Post edited April 11, 2020 by Kohleran