Can't denoising be stopped too by user? For example by pressing again the ESC key.
I mean to handle the kind of situation where you want to stop and trash without waiting useless denoising seconds/minutes.
Edit:
I was playin with parameters and I got strange results with scale:
Simple scene with cube over a plane both simply white 0.7 matte material. Nothing fancy, everything stock.
Scale = from 4 to 8 got this strange thing, it's not always the same but it's what I get. Black background with R, G, B squares on the bottom. At Scale 9 and 10 blender crashes.
Haven't tried to go far.