Game menus - Options - Graphics

Fullscreen: Fullscreen or windowed mode. Windowed mode is not recommended unless your desktop has the same resolution as selected for the game.

High detail: Turn game high detail on and off.

Performance tips: If you experience lagging or game levels do not start at all your PC may be too slow for the game.

To improve game performance do the following steps:

1. Lower screen resolution.
2. Turn off high detail.
3. In Moon Editor un check Generate large cities.