Warning Num Samples Per Thread Reduced To 32768 Rendering Might Be Slower [ Top ◉ ]

Each thread uses a stack to store local variables. Huge sample batches might require more stack space than the operating system allocated (typically 1–8 MB). To avoid a stack overflow and a crash, the runtime reduces the batch size.

Use the Optimizing Memory Usage Guide from Chaos Support to reduce scene heavy-hitters. Each thread uses a stack to store local variables

Are you seeing this warning on a specific scene, or does it happen even with a ? Each thread uses a stack to store local variables