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There are several reasons why this warning might occur:

If you tell me which (Blender, Unreal, etc.) and render engine (Cycles, OptiX, CUDA, etc.) you’re using, I can give you exact steps to remove or work around the warning.

: The scene (geometry, textures, and light cache) is larger than your GPU's total video memory. High Resolution

: The engine has detected that there is not enough free memory to maintain optimal performance for the current scene complexity or resolution. Stability Over Speed

Warning Num Samples Per Thread Reduced To 32768 Rendering Might Be Slower Jun 2026

There are several reasons why this warning might occur:

If you tell me which (Blender, Unreal, etc.) and render engine (Cycles, OptiX, CUDA, etc.) you’re using, I can give you exact steps to remove or work around the warning.

: The scene (geometry, textures, and light cache) is larger than your GPU's total video memory. High Resolution

: The engine has detected that there is not enough free memory to maintain optimal performance for the current scene complexity or resolution. Stability Over Speed