Thanks for all the feedback.  I'm embarrassed to say that I took a closer look at what I "thought" were just mapped materials I bought and it turns out they're all procedurals, but some of them have maps.  lol.  And, as some of you pointed out the render speed is just fine.  I don't know how I got the idea in to my head that Poser procedurals were slow to render.  Some of them are, but most seem to be fine.