Warning Num Samples Per Thread Reduced To 32768 Rendering Might Be Slower [best] Jun 2026

The software limits how many data samples (e.g., pixels, rays, sound samples) each CPU/GPU thread can handle at once. The limit was lowered to 32,768 — probably because of hardware constraints (e.g., low memory per core, or driver-enforced safety).

: The warning indicates that the rendering might be slower. A reduction in the number of samples per thread could lead to less accurate images or more noticeable aliasing and artifacts but can help maintain performance. The software limits how many data samples (e

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. A reduction in the number of samples per

If you are using Progressive rendering mode, change it to Bucket mode. Bucket rendering processes the image in smaller localized chunks, requiring substantially less concurrent memory than processing the entire frame at once. You might find one combination avoids the warning entirely