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

: When V-Ray realizes it cannot allocate enough memory for its default streaming buffers, it scales down the block size. It forces the hardware down to a hard floor of 32,768 samples per thread to prevent an outright out-of-memory (OOM) crash.

❌ No — it's a normal protective measure, not a hardware error.

objects, which generate massive amounts of geometry at render time. Clean Up Render Elements : Remove any Render Elements : When V-Ray realizes it cannot allocate enough

Limit the number of extra render passes (like AO, shadows, or reflections) you are outputting at once.

In simple terms, when rendering an image or animation, the software divides the image into tiny samples, which are then processed and combined to produce the final output. The number of samples per thread (a thread being a separate processing unit within the software) determines how much data is processed simultaneously. objects, which generate massive amounts of geometry at

There are several reasons why this warning might occur:

Plan:

: Large 4K or 8K textures consume massive amounts of VRAM. Try downscaling textures or using 2K versions.

If you notice a significant slowdown or want to clear the warning, try these optimization steps: Switch to Progressive Mode Progressive Image Sampler The number of samples per thread (a thread

Convert heavy geometry to proxies.

Outdated drivers often have inefficient memory management or buggy kernel scheduling. Update to the latest: