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

Corona 12 a lot slower on old scenes

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MarkusB.:
Hi everyone,

we just upgraded to corona 12 and did some test renders with projects from this year, all done with corona 11.
What we noticed is a huge increase in rendertimes, when rendering with corona12!

scene 1:
corona11: 27:21 min
corona12: 40:16 min

scene 2:
corona11: 6:25 min
corona12: 7:30 min

scene 3:
corona11: 4:40 min
corona12: 7:29 min

This basicly happens with every scene we open. All tests are done on the same PC (Threadripper 3970x), with same rendersettings.
Did anything changed from corona 11 to corona 12, so that old scenes need to be adjusted ?

Attachted are two screenshots. (had to blur the image, sorry)

Any help is greatly appriciated, because this increases are huge!

Thank you
Markus

romullus:
Could you try to reset render setup and re-create it as faithfully as you can? It's possible that some settings got corrupted when loading a scene created in previous version and now it negatively impacts render speed. I didn't compared Corona 11 vs 12, but i did quick comparison to Corona 9 recently and the latest version was significantly faster.

maru:
You are getting different rays/s values indeed. This may be a silly question, but are you sure it is not related to thermal throttling? There is currently a heatwave in a lot of countries.
If not, then we would be interested in checking your scenes: https://support.chaos.com/hc/en-us/requests/new

MarkusB.:

--- Quote from: romullus on 2024-07-16, 16:30:45 ---Could you try to reset render setup and re-create it as faithfully as you can? It's possible that some settings got corrupted when loading a scene created in previous version and now it negatively impacts render speed. I didn't compared Corona 11 vs 12, but i did quick comparison to Corona 9 recently and the latest version was significantly faster.

--- End quote ---

Will give this a try tomorrow and report it.
To be sure, I will merge it all into a new blank scene.

MarkusB.:

--- Quote from: maru on 2024-07-16, 17:32:02 ---You are getting different rays/s values indeed. This may be a silly question, but are you sure it is not related to thermal throttling? There is currently a heatwave in a lot of countries.
If not, then we would be interested in checking your scenes: https://support.chaos.com/hc/en-us/requests/new

--- End quote ---
.
Workstation is watercooled and CPU temps never ever go above 65°C.

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