Cycles – Render 10x faster with a SINGLE setting!

3d illusions writes:
In this quick tip video, we’ll learn about a single setting that will not only make cycles up to 10x faster with no discernible difference in quality, but will also make Blender MASSIVELY more responsive!

good iinformation ,, thanks
Interresting, I wonder if there is an efficient way to add this testing to my Super Fast Render addon