include/exclude in lights render slowdown

[frodopytlicek]

Hi,
I know that including or excluding object from lights can slow down render, but 2h render can become 6 hour render only because of this? Is there some way how to fix this and why its so render time heavy?

[frodopytlicek]

No one has anything to say?

[vladimir_krastev]

Hi, thanks for posting. There could be big differences.
For instance a simple scene like this

If we exclude one of the boxes the render time is 5 minutes but with both boxes included the time is 7 minutes (10K resolution with high settings).

We might need a scene in order to help you better. Please archive it and send it here or through the support contact form.

[frodopytlicek]

It's not possible to send it's heavy and connected to too many assets. But I don't have problem to not use include/exclude, I don't like it myself and I'm not using it. I just want to know where is the catch and why it's slower, to understand it better. Thanks.