Corona Mapping Randomizer slowdown

[hrvojezg00]

We`ve experienced some slowdowns in rendering, I believe, since C9 and never got to figure out what seemed to cause that, but the latest tests show it`s the Corona Mapping Randomizer. I believe there was a bug before with the UVW randomizer; it seems it shows up again. I`m uploading an interactive render test of a simple scene, with and without the Corona Mapping Randomizer applied to the wood texture. With it applied, rays are down by 50%. Do you have any insight on this?

[romullus]

Make sure that high quality blending is turned OFF, unless you absolutely need it. It's known to be real performance killer in mapping randomizer.

[hrvojezg00]

Thanks, this worked! Any other modifiers that are problematic like this one?