Quote - Here is a quote from another thread where some user were reporting  48-96 hour render times for one frame with the new IDL:
***"Plus for IDL, the Diffuse_Value should not ever be 1 - it should be around .8, but only for materials that are opaque. Water is completely transparent, and has NO diffuse reflection at all.
Remove the image that goes to Diffuse_Color altogether. 
Set Diffuse_Value = 0.
Remove the Reflect node.
Disconnect the other image from the Refract_Color channel.
Connect a Fresnel node to Refract_Color, and set Refract_Value = .9
Set the IOR on the Fresnel to 1.333.
Render without IDL and see how that looks.
Then if the bump map is not a JPEG or is huge, I'd open it in Photoshop, and save it as JPEG, no more than 1K in dimension.
Your render settings show Min Shading Rate = 0. That's really aggressive. Try test render with it at 1. If things look blotchy, try .5.
On the water prop, I'd set the water Min Shading Rate to 1, even if you need a better rate on the rest of the scene.
Render without IDL, and see how it looks. Then try with IDL again."

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With all well deserved respect to this person(Bagginsbill) he is truly a master of his field
But this just makes my head hurt
Posers is still largely an application for "lay people"
and to a "lay person" this may as well be the formula
for grinding a custom lense for the hubble telescope.

To be charitable, we have here the confluence of three factors:

1. Nearly all (I would say at this time all, except some with the P8 content) materials are not designed with P8 in mind.
2. Nearly all water (or glass) props are optically incorrect. For clear water you pretty much need fresnel, for tinted water you either need additional nodes, or can fake it with reflection and refraction nodes (but note that this won't work well with P8). There are a lot of water props that just use reflection.
3. BB is very interested in optically correct materials, so he will try to get things as accurate as possible.