I'm trying to use Poser's Depth of Field function.  Is it ALWAYS really slow, or should I have NOT bumped the pixel samples to 4 and used Gaussian in my render settings?

A 700 x 700 pixel render, which normally takes less than 20 minutes to render using IDL in Poser Pro 2012 has been going for over 90 minutes now, yet looks to be only 10% done.