This is the "Tile Multipass" feature.AndreasResch wrote: ↑Tue Mar 16, 2021 12:14 pm There also seems to be a bug somewhere. In my big scene I had it running for over an hour and almost all tiles were converged, when suddenly all converged tiles were gone (all green markers disappeared) and they were considered again and rerendered. Might be a bug or some method that makes this even more complicated to understand. From what I have seen in smaller test renderings, once a tile is converged, it stays so til the end.
Read the tooltip of the "threshold reduction" parameter.