I've been playing and already have almost 15 hours of gameplay without crashes. Didn't saw any slowdowns on menu or inventory.
1) Linux Mint Cinnamon 18.2 (64 bits)
2) I use the FOV FIX from https://github.com/ThirteenAG/WidescreenFixesPack/releases/tag/callofcthulhu
(Just added dinput8.dll on DLL overrides)
3) My install runs on Wine-Staging 2.19 through PlayOnLinux. Default partition on Windows 7 32 bits..
Since this is my first time with Dark Corners I don't know if I'm missing something here but I don't see any movies when starting. Someone can say if this is a wrong behavior?