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It's working fine with the GOG version for me, it should also woth with Slain.
https://www.nexusmods.com/valfaris/mods/3?tab=description

Of course it will drain your system resources more than vanilla, but for me the result is worth it. I only had a couple of slowdowns here and there but you can select what to keep or deactivate with the mod menu.
Post edited July 05, 2021 by Dogmaus