okay so, the game does drop a few frames in one specific area in savannah citadel day act 1 if i have the shadow resolution set to 8192. but if i drop it down to 4096, it's all good.
i installed the game on my Arch Linux install and the vsync thing does not happen, i think it might be a driver issue because i remember something similar happening in GTA V.
overall, the game just runs better on Arch for me. especially when the resolution scale is set to 200% (of 1360x768, which is my screen's resolution). i tested it by going to the hub area in chun-nan (the one where you're supposed to actually go to the level). dropped down to ~40 FPS on Windows 11, stayed at 60 FPS on Arch. i'm probably gonna keep it at 100% just to be safe.
so yeah, i'll be playing it on Arch now.