edit: issue resolved!
Hey! Very strange to hear this - I don't think I've run into anyone else having this issue (that wasn't running the game off an old Thinkpad).
The only thing that comes to mind is that if you happened to be recording, perhaps the default resolution is creating some issues. I saw someone else experiencing slight lag on a normal machine while they were recording and having not changed the standard resolution, and it immediately fixed itself after switching to 1080 down from 1440.
If you have the time and patience, you could try setting the resolution down in the options tab of the main menu, and seeing if that helps.
Either way, thanks for the interest and sorry that it didn't run! I'll investigate this further.