A long, five years of mystery has been solved! The game's open area was running slow, and after a long time, I have managed to find its reason. My previous frame rate has been almost doubled.
Please enjoy the game with much higher frame rates now.
Significantly Optimized!
Build and release context
Steam update times within 24 hours of this post. Matching dates do not confirm which build it describes.
Build 18617972 · public branch
Steam updated · First observed
Build 18617972 · test branch
Steam updated · First observed