Scenario: External Illumination only (illum. color, Physky, HDRI) large GI portals
There is difference in rendertime depending on which source of external illumination you choose. In this case (!)
HDRI being the fastest,
illumination color almost identical and
Physky being the slowest which makes sense since it contains a sky and a sun.
Reducing the GI portals' size increases rendertime slightly when using the same amount of samples. But you would need higher settings with the small portals anyway as we already discovered and see again here.
Most likely the results can vary depending on the sun angle when choosing Physky or the type of HDRI for image based lighting.
Scenario: External Illumination only (illum. color, Physky, HDRI) small GI portals
click to enlarge
To give you a better overview of this situation take a look at the diagram:
click to enlarge
Cinema 4D R19
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