Quality run: 1024 x 1024, 64 camera samples, 4 glossy samples, 4 light samples, depth 4, FP64 on the NVIDIA CUDA device. These settings differ from the accepted CPU comparison; timings are not a matched-work speedup. Authored scenes render first, followed by the material variants.
Isolated render source and worker binaries: /home/movj/code/dev/Ray_Tracer_FSharp/artifacts/gpu-snapshot-20260907. Changes in the development tree cannot replace these workers.