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

This warning indicates that the rendering pipeline or graphics driver has reduced the number of samples processed per thread to 32,768, which can lower parallelism and increase render time. It typically appears in GPU-accelerated rendering, real-time graphics, or compute shaders when hardware or driver resource limits or safety checks force a reduction in per-thread workload.

: Use the "Resize Textures" option in V-Ray settings or convert high-resolution textures (4K/8K) to 2K or lower.

. To ensure the render doesn't crash from an "Out of Memory" error, V-Ray automatically reduces the number of samples processed per thread to fit the data into the remaining space. What This Means Performance Hit This warning indicates that the rendering pipeline or

: Ensure you are using the latest version of V-Ray, as newer versions have better "out-of-core" texture rendering to handle scenes larger than the VRAM. Chaos Forums Are you rendering a specific high-resolution scene , or does this happen even with simple test files

3. How to Fix "Num samples per thread" Warning (Optimization Techniques) Chaos Forums Are you rendering a specific high-resolution

Let’s look at typical user actions that trigger the warning.

The warning can occur due to various reasons, including: This warning indicates that the rendering pipeline or

If you are working with GPU-accelerated rendering engines like Blender (Cycles), Octane Render, or V-Ray, you may encounter this performance warning in your render log: .