Hello!
Here to resurrect these dead threads from the old platform because these are now relatively old bugs that drastically impact gameplay and still have not been resolved. Anno 1800 on my i7-8700k, 32GB RAM, RTX 3080, Windows 10 x64 Pro rig still progressively loses frame rate performance on Windows 10 until a full reboot. After which, the performance loss process restarts all over again. However, I have noticed since coming back to the game several months later and another Season Pass investment that this bug is still around and now happens in an even quicker timespan. Before I would lose performance over a period of 45min - 120min. Now the game just starts hemorraging performance about 10 minutes into play time. To be clear I am also starting a fresh save and haven't even built a shipyard yet and the game slowly bleeds from 100+fps to 40-50fps, to sub 30FPS. Ubisoft devs please coordinate with me on troubleshooting this. I love the game and would love to be able to play it for long periods of time without having to revert to ancient drivers for stable performance or just not play at all!
See my previous threads on this bug here:
https://forums.ubisoft.com/showthread.php/2332897-Issues-relating-to-driver-update-461-92
https://forums.ubisoft.com/showthread.php/2304972-Latest-NVIDIA-drivers-result-in-low-fps-after-certain-time