My setup:
CPU: Ryzen 7 5700X
GPU: RTX 4060
RAM: 32 GB DDR5
I also get FPS drops, but mostly on the Calais - Duisburg road.
In Calais it can go down to ~20 FPS,
In Duisburg it’s usually around ~30 FPS.
Everywhere else the game runs fine, even on high settings. From what I’ve seen, the only thing that really helps is lowering the render distance and the number of visible players in the TruckersMP settings.
Regards
Alex Miller