I discovered the problem, here's the solution
I had the same problem of 10 FPS, messing around in the game files I discovered what was wrong.
Go to steam right click on "FarCry 5" and click on "properties". Then, go to "Local Files" and "Browse Local Files". Once you have done that you go to "bin" and right click on ArcadeEditor64, (I have my PC in spanish so I'm not quite sure if the traslation for the following options are right, sorry for that) then go to "Launch with GPU" and last option (change predetermined GPU). Go to the option under 3D config, "control 3D config". In "1." add ArcadeEditor64 --> in 2. choose the NVIDA processor option, save and try out the launcher.
Hope it works for you, sorry if the instructions are a bit messy
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