I have the same rig setup and the same performance issues.
Tangled shores 45fps
Switching to multi threaded = 1 improves performance but gives lots of flickering artifacts
I notice that all across the game GPU usage is low on 1080p, around ~30-80%, regardless of video settings.
I also experience micro stuttering where the game freezes for half a second, and it happens quite often.
I've tried all the other solutions provided but nothing helps.
All other games run smooth with 95%+ GPU usage and no issues.
https://pastebin.com/msaD031N
English
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For AMD try installing the old Radeon Adrenalin 2020 20.4.2 driver and report the result.
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rip cant even use that driver with what i have