From Cycles documentation about Light Paths:

The maximum number of transparent bounces is controlled separately from other bounces. It is also possible to use probabilistic termination of transparent bounces, which might help rendering many layers of transparency.

What should I do to start using this probabilistic termination?

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    $\begingroup$ Thank you! I've already started to forget 2.79 )) There's still Min Transparent Bounces chekbox in 2.9, it is in the Render Settings > Sampling > Advanced but it doesn't seem to affect anything. $\endgroup$ Mar 22 at 10:54

From Blender Manual > Light Paths > Bounce Control

Light paths are terminated probabilistically when specifying a minimum number of light bounces lower than the maximum. In that case, paths longer than minimum will be randomly stopped when they are expected to contribute less light to the image. This will still converge to the same image, but renders faster while possibly being noisier.

enter image description here

Related thread on BlenderArtists.org


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