This warning typically appears when using (like Blender, Unreal Engine, certain video editors, or 3D renderers) that relies on multithreaded processing.

❌ On some hardware/drivers, it could be 16384 or 65536. The exact number varies.

The root cause lies in , usually memory-related. Here are the most common scenarios:

: Because fewer samples are processed simultaneously, the overall rendering time will likely increase. VRAM Constraints

This is the easiest fix. Older versions of Embree, OSPRay, or your graphics driver may have overly conservative limits.