Like, seriously dude, yeah like headache when I had to much to drink like the night before.
Feeling like a broken record here, it could be the crappy framerate, or I don’t what, because I use TrackIR in combat flight sims and other games and that type of extreme motion does not affect me. For KCD it’s all about the FPV game image jerking around when your body doesn’t feel motion input at all, and worse you aren’t providing input even with a mouse (horseback and image bobbing), so the disconnect between the senses/input is the source. I don’t get motion sick on a boat, never have even in bad weather on North Atlantic.
Remember the movie ‘Blair Witch Project’ filmed entirely with FPV handheld? Google Blair Witch Project motion sickness, so yes, seriously lots of people get sick from this disconnect.