Warning Num Samples Per Thread Reduced To 32768 Rendering Might Be Slower ((better)) [Exclusive Deal]

class RenderController : public QObject Q_OBJECT Q_PROPERTY(int samplesPerThread READ samplesPerThread NOTIFY configChanged)

If you encounter this message frequently, you can optimize your scene using these methods recommended by Chaos Support Switch to Progressive Sampler Progressive Image Sampler In Blender Cycles, large tile sizes (e

The warning typically occurs in V-Ray or similar GPU-accelerated renderers when your scene is reaching the memory (VRAM) ceiling of your graphics card . Why This Happens In Blender Cycles

: If your "Samples Per Pixel" or "Path Tracing" settings are extremely high, the GPU may run out of registers per thread. large tile sizes (e.g.

When you initiate a GPU or hybrid (CUDA/RTX) render, V-Ray attempts to load all scene assets—including geometry, high-resolution textures, lighting caches, and frame buffers—directly into your graphics card's physical memory.

In Blender Cycles, large tile sizes (e.g., 512×512) tend to increase per‑thread sample counts. Smaller tiles (e.g., 256×256) may stay under the limit. Experiment:

When this warning triggers, your GPU isn't "broken," but it is . Without Warning With Warning GPU Utilization High (Efficient) High (But high overhead) Memory Usage Fragmented Render Time 10%–30% Slower