Hi Romulus,
there was no memory warning. Now i tried it without 2.5D Displacement. But it's almost the same result: After 2.08 hours render time 11% Noise and the Estimated remaining was 7.30 hours (before i stopped the rendering).
And also in this test: No problem with a memory warning. I attach the the RAM-Usage window of my system. There you can see: More than enough free memory (about 25 GB).
I was hoping it might be a special problem just with this scene. But the problem also exists in other scenes (i tested small other scenes): Corona V4 4.17 minutes, Corona V5 5.00 minutes, Corona V5 without 2.5D Displacement 5.12 minutes
I don‘t know if the problem is the MacPro (2012, 2 x 6 Core 3,45 GHZ), the mac OS (High Sierra 10.13.6), the C4D (R19) version or what else.
At the moment I only know that Corona V4 works well and I'm thinking about downgrading again to this version.
But i hope that there is anyone who can solve this problem ;-).
How can i go back to Corona 4? Shall i just start the installer?