Corona CESSENTIAL_Indirect and CShading_Shadows elements always very much noisy than the rest elements-- even with default Corona material and default Lighting settings as white color Corona environment and
we can't get a clear result even with 1%-0.5% noise limit and with Corona High Quality Denoise Filter.
This elements are very necessary for compositing in some cases, and now it’s impossible to use them in any way.
This problem in all Corona version's from 3 to 4 last releases:)
We never had such a problem in Vray render/
