Turn Off Windows Defender if the Game Constantly Freezes (Patreon)

Some players experienced severe frame rate drop and frequent crashes from Ver. 1.20, this is due to some conflicts between Unreal Engine 4.18 and Windows 10. Shutting off real time protection of Windows Defender before launching the game is reportedly a viable solution.

Since it's unknown if a bug fix can be released before Fallen Doll 1.22 is finished, you may want to use another security software if you don't want to leave your computer unprotected while running the game, however this is likely to be unnecessary.