Frames Per Second (& Co-Op)

[scrod]

Hi there,
I have just got this game today and am wanting to know how I can view my Frames Per Second. Is there a console command for drawing fps or a graph of stats? Or are people using 3rd party tools to get a display of their FPS reading?

Cheers

PS
Finding the game very fun so far and would welcome some Co-Op if anyone is interested.