DOF takes too long to render

So I was playing around with Mental Rays Depth Of Field Lens. I do this a lot. I want to know what something does and I just experiment. I'm not sure why. My guess is because I want to know how everything works, so that I can apply it or use it some way if I ever come up with a cool idea. The truth is I have a ton of ideas, but like everything else I often am trying to do too many things at once.

Anyhow I thought I would share this image. It's a still taking from an animation I did this spring for class. I'm using a low end PC (AMD Dual Core somthing or other and 2 gig of ram), but even rending in Mental Ray using production quality it only takes a a few minutes. This still took 33 minutes.

I guess I won't be using DOF any time soon.

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