To access the console you must edit some files.
To Enable Console
Open the Game.prefs file with Notepad. This file is located in My Documents\My Games\Gas Powered Games\Demigod.
Add the following lines to the beginning of the file (above the 'profile = {'):
debug = {
enable_debug_facilities = true
}
Showing the framerate is easy just 'Shift-F7' = 'debug_show_stats', It shows a variety of information: Fps. Render Speed, Sim Speed, Frame Time, and how long you've been playing.
There are many other key combinations for commands such as teleport, spawn units, even a vary cool ring.