actually i investigated a little bit. And here is the trouble ... I'm playing on my main monitor which is 4k, with a 1080. Most games are ok with that, but that's like 4 times more pixels to fill than regular 1980x1024. I had my daughter play the game (yes it's that good), she played it in on the other screen (regular size this one), and it was silky smooth. It's not the first game i have this issue with, some of them go around the issue by rendering on a smaller image, then displaying that scaled up. Still, the game is nice, but i think that kind of fidelity should work at 4k, tho maybe not for a jam game =)