Warning Num Samples Per Thread Reduced To 32768 Rendering Might Be Slower ((install))

The best approach is diagnostic:

A: Absolutely not. num_samples_per_thread is about batching work, not the total samples per pixel. Noise remains unchanged. The best approach is diagnostic: A: Absolutely not

If you’re using GPU+CPU hybrid, switch to GPU-only. Or switch from CUDA to OptiX (for RTX cards). You might find one combination avoids the warning entirely. The best approach is diagnostic: A: Absolutely not