While in-game, hold CTRL + SHIFT + TILDE(~) or CTRL + SHIFT + @ to open the console, and enter any of the following codes.

Code	Effect
ee_bigheadmode(1/0)	Big Head Mode. 1 for on, 0 for off.
statgraph_channel("fps")	Display frames per second
statgraph()	Enable "statgraph_channel" codes
taskbar_hide	Hide taskbar
abortgame	Quit game
restart	Restart game
setsimrate[number]	Set game speed (default is 8)
taskbar_show	Show taskbar
FOW_Toggle	Toggles Fog of War on/off