Yup, a well known issue. Here's some things you can do: - lower the maximum texture size to 1024; - increase the minimum shading rate (keep it at 1.0 or less though) - lower the bucket size to 16 If you're using many spotlights to simulate global illumination, replace those with a single IBL light with AO enabled and shadows disabled. A few (no more than 4) additional (spot or point) lights should be enough to light your scene. If you're using mapped shadows, lower the shadow map size. Play with the shadow cams (look through each shadow cam, and zoom and pan until only the visible portion of the scene is visible in the shadow cam), that will get you nice shadows without using extreme shadow maps. Try raytraced shadows wherever possible. If you're using Gather nodes, a complex scene sometimes refuses to render. Hope this helps.

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