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

Select CUDA mode and check both your GPU and your CPU in the device selection panel. This allows the system to split heavy geometry allocations with your system RAM.

By reducing this, the engine is sacrificing speed for stability to avoid your graphics driver crashing. Why is this Happening? (Common Causes)

Applications like web browsers (Chrome), Photoshop, or Substance Painter can occupy several gigabytes of VRAM. Select CUDA mode and check both your GPU

: This issue often surfaces mid-way through an animation sequence. While the first few frames might clear out smoothly, incremental cached data, moving geometry, or motion blur calculations gradually accumulate until the graphics memory overflows.

In controlled tests using Blender 3.6+ Cycles on an NVIDIA RTX 3060 (12GB VRAM), a scene with 4096 samples showed: Why is this Happening

int getActiveSamples() return samplesPerThread;

Are you seeing this warning on a specific scene, or does it happen even with a ? While the first few frames might clear out

For Blender Cycles (as of 4.0+), this parameter is not user-accessible in the UI. However, you can set it via Python script: