We are currently confirming the issues below, and are preparing a patch to handle these issues.
We apologize for any inconvenience that such issues might cause, and kindly ask for your patience until corrective measures are applied.

If the gameplay in the Steam version becomes very sluggish/slow please refer to the following:

If a NVIDIA graphics card is being used and the game becomes very sluggish/slow, try the following steps:

1. Open the NVIDIA Control Panel.
2. Open "3D Settings" in "Select Task" and select "Manage 3D Settings".
3. Change the "Preferred Graphics Processor" setting to "High Performance NVIDIA Processor" on the "Global Settings" tab and click Apply.
4. Restart the game.