Try this: https://www.youtube.com/watch?v=pH9D__g1yqs

Only works with nvidia users.

Yeah that doesn't work for me. Although now I'm using RivaTuner Statistics Server and it doesn't seem to impact the loading times that much. But if there isn't a way to custom lock the frame rate I would like to not have to uncheck the "Unlock game speed" bock's in the menu. Is there a way to keep it unchecked?

Has anyone found working solution for FPS issues in Revenant?

I have ATI Radeon GPU and Windows XP, but game is either running very wonky and getting 10-15 fps lags with limiter on, or getting over 500fps with limiter off, so can't play either way. After running through launcher.exe and ticking buffers, maxing out details etc. it locks up on 75fps, so it's bit better, but still too fast.

Does anyone now how to lock up FPS to, let's say, 40fps? RTSS doesnt seem to be working

Does anyone have a solution for this problem?

in D3D mode i get 20 fps and the game isn't nearly as smooth as in software mode, but when I uncheck lock game speed it goes crazy fast.

Run the game in Direct3D through dgVoodoo wrapper. The game runs at 25 fps as it should.
https://www.gog.com/forum/revenant/howto_make_the_revenant_run_in_d3d
Works for both NVidia and AMD.
You may want to try turn compatibility mode off. But that can break the game on WinXP.