Plain question^^ What does the adaptive sampling in the render settings do? I could not find it in the manual and only remarks in some threads here. I understand it speeds up render time. But should I leave it at the default 0.00? Or are other values better? How does it work anyway?

what i understood from webinar

When you render it's made bucket by bucket. One bucket for a thread, At end of bucket render next bucket.

Visualize the rendering in progressive mode, filling slowly the missing points and removing fireflies ?

this parameter is a way to accelerate the calculation stopping it when almost nothing evolves.in a bucket.

basicaly : 0 means auto - magic. if you use 0.10 it means that when less than 10% of a bucket pixels changes in a rendering pass, it stops computing the bucket and move to the next one.

so the bigger, the blurer, the quicker.

I get good results leaving it at default (0.00) It does speed up renders.