Depending on the game speed setting, the game simulation is simply run at different speeds. Internally, as well as in the editor, all time-related values are based on Normal speed. An exception to this is the campaign on Brutal difficulty, which locks the game speed at Faster. In games with only one human player it can be altered during play in the Gameplay options. In custom games the game speed can be set in the lobby by the host. In the campaign, co-op and versus AI modes, the game speed is set based on the selected difficulty (e.g., Normal difficulty runs at Normal speed, Brutal difficulty at Faster). Faster is the default speed for custom and ladder matches. There are five speed settings to choose from: Slower, Slow, Normal, Fast and Faster. Game Speed is the speed at which your game runs.
