I have a scene. Interior. Kind of a space station (again...
). No sun, no atmosphere. Lighting only by self illuminated textures. I tried it with the path tracer, but it was noisy as hell, and the rendertimes were incredibly high with higher settings and still noisy. So I used the legacy renderer. It looks OK, but I badly miss the PT shader possibilities, especially for reflections.
However, here is my question: why does the exact same scene with a premade GI cache take 4-5 minutes per frame to render, and without premade GI cache less than one and a half minute? As I said, it's the same scene, no changes. I always thought a premade GI cache would reduce rendertimes, since the GI calculation is already made.