Wow you are amazing! To be honest I did not expect to get a reply, especially not a fast reply like this with the update I have asked for. If I was expecting a reply it was more something like "no sorry it is not possible to optimize this game".
But the game runs smooth now! Even with turned on shadows. It took me now something like 15 minutes to get the scroll list in the vulcano and I was able to finish the game.
Here is the "proof". :)
As you can see the option "potato graphics" was still on. But after finishing the game I went back to the vulcano without that option on and it still runs smooth after that now.
Here are my hardware specifications:
Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz 3.40 GHz
16 GB Memory
Geforce GTX 1050
Windows 10