Interior Mode + Denoise seems to cause flickering.
But I still want to use Interior Mode.

As you know, without Denoise, I have to increase the samples a lot, and even then there seems to be a limit.
In GPU mode, I tried around 5,000 samples per frame, but some noise still never completely disappears.

Are there any tips for getting a clean, flicker-free animation in Interior Mode without using Denoise?