Render times on MSI notebook

CPU: Intel i7-4700HQ@2.4GHz, 4 cores
16: 6m
32: 6m30s
64: 6m
128: 5m30s
256: 4m
512: Didn’t even compute the time
1024: 30m

GPU: nVidia GeForce GTX 765M, 768 CUDA cores
16: 2+ hours
32: 37m
64: 10m
128: 7m
256: 5m30s
512: 7m
1024: 7m30s

Very inconsistent all around, but the best results are:
CPU@256x256: 4 minutes
GPU@256x256: 5m30s

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