Bring down the console (by default Control-Shift-Tilde) and type:

statgraph()
statgraph_channel("fps")

this will display a graph in the top right corner of the screen, with the current frame-per-second.

Press [Shif + [Enter] while playing the game, then enter one of the following codes to activate the corresponding cheat function:

Cheat Code - Effect

cheat_power( n ) - Give yourself "n" units of power
cheat_requisition( n ) - Give yourself "n" units of requisition
cheat_killself - Kill yourself
cheat_revealall - Reveal all FOW