Chaos Corona for 3ds Max > [Max] General Discussion

Corona 12 a lot slower on old scenes

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MarkusB.:
Update:
Like suggested, I merged in the "old" corona 11 into a brandnew scene and setup corona12.
The rendering times went down indeed. We now have:

scene 1:
Corona11: 27:21 min
Corona12: 40:16 min
Corona12 (new file): 36:37 min

scene 2:
Corona11: 6:25 min
Corona12: 7:30 min
Corona12 (new file): 6:40 min

It renders faster now compared to just open the old file.
However, we are still a lot slower than corona 11.

Any more suggestions?

Marijan:
I'm experiencing the same thing, especially on exterior scenes.
For the same amount of passes and noise level render times are quite different.
IR also seems slower in Corona 12.

Corona 11: 09:16 min
Corona 12: 13:56 min

AMD 7970x, Max 2024.2.3, Windows 11
I have reported this with one scene included (Id #268872).

ProxyFuel:
Same here—I just made a post about it. There’s definitely something off with version 12. It’s noticeably slower when we test it across our machines. As a school, we have several computer labs with completely different setups, so it's not a specific hardware issue. Scenes that ran quickly in version 11 are now sluggish, even when merged into empty scenes. This seems like a software issue that needs to be addressed ASAP.

maru:
(Last message continued here: https://forum.corona-renderer.com/index.php?topic=43436.0)

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