I’ve done some more testing and setting the spatial and temporal samples to 64 gives good, clear results. I also checked Reference Motion Blur in the Path Tracer settings, which I think improved the clarity. This all works great at 1080p resolution, which takes about 5 minutes to render my shot, but when I boost the resolution up to 4k, the same render needed 3 hours to complete!! Not sure if this is a bug or if this massively exponential increase in time makes sense…
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