There are three levels which can be configured in the mod startup settings:

• "Light" dramatically reduces the lifetime of blood and gore particles emitted when enemies die. This reduces the number of draw calls needed when many enemies are being killed in a short time.

• "Heavy" also removes the blood pools displayed under biter and spitter corpses.

• "Extreme" makes biter and spitter corpses fade out after 30 seconds. (The default is 15 minutes!) This changes the feel of the game substantially, but may be helpful if you're killing a ton of enemies.