Very slow LC (GPU) and big difference between Cuda and RTX renders

[BBB3]

Thanks a lot. Yes, the slow LC doesn’t seem to happen all the time, which makes it very annoying. Over here, the first two or three renders I do happen normally, and only after a while does the LC start slowing down. After that it’s always slow up to the next restart. Not sure what to make of it.

[Muhammed_Hamed]

Thanks for the extra information Bertrand, we pushed a fix to address this behavior. I have tested with your scene on multiple GPUs, it works really well.
This change should be part of the next beta build

Best,
Muhammed