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Just a quick question (I think I read it somewhere before but I don't remember)...
Does the size of the HDR image influence noise/time on the render? should I use a smaller/blurrier image for the Illumination slot and a higher resolution image for the Reflection/Refraction slot?
Thanks.
Cheers!

No, the dimension or blurriness do not affect render speed or noise. Render speed is only affected by contrast of your map. For example, a sky with tiny sun may render slower than an overcast sky.

Ok, got it.
Many thanks!
Cheers.