Thanks to Luxcorerender Photon Gi cache i'm able to complete this old project. The project was designed and modelled in the early days of luxcore ribirth but i wasn't able to animate it (render speed without recent improvement was a bit too high).
I7 8700k + RTX 2060super
Photon Gi cache
rendertime = 80sc/frame or 1.20mn per frames.
Youtube Link
https://youtu.be/Jc7e-LfhHm4