Sampling, Path Tracing:
Samples: e.g. 70.
Cycles renders all 70 Samples, regardless of whether the tile is
changing or not.
Often that's not neccessary in the main parts of the picture...
Maybe it's a idea to add a possibility to define a threshold by
comparing new an old images of the tile. (e.g. max. change of RGB value
in pixels)
Especially in areas where only background is present, the engine could
abort sampling after one or two samples. This would save a lot of time
at unattended rendering.
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