Unstable FPS. I ask for the patch

[Gadavre]

In custom stories, as a rule, in large open spaces, the FPS drops from 60 frames to 30. If it rains or some other resource-intensive effects, then the FPS also drops. And this problem occurs even on more powerful computers! I have to notice that my system configuration meets your system requirements:
windows 7 (64-bit), core i5 4430 3.00 ghz, 8 gb Ram, GTX 660 (2GB), Resolution 1920 x 1080.

Amnesia: the dark Descent is a very old game. Please make a patch that will use the capabilities of more modern video cards and RAM! Make a patch that will remove the dropping  in FPS and lags of a game in difficult large  locations!

For example, let's play the mod "Final Revelations Remastered" and load the map "BrutalMansion". Not very nice to play.....