Im gona be a little short on time this week,so wont have time to write full guide but heres small explaining on how to get the fog backed up and couple links.
Place it inside game folder and run the game using the dpyes.exe
In game press f5. a small window should pop up. navigate to grimcam, and you will see couple camera control settings you can play arround with…
this the option that controls fog distance, if im not rong its in metter or units, i dont know xD but the distance prolly gona depend on your screen size / FoV / Camera pitch and preference.
I like my at 40-60 depending on area, because i will only see the fog at the edges of my 1080p screen, or when you go up a hill or something like that. the distance is not just horizontal but vertical 
Dont forget to leave a like / thank you in the dpyes page its a great tool
texture pack
GrimTex at Grim Dawn Nexus - Mods and Community (nexusmods.com)
really cool texture work. Download according to your vram. I think even the (0.5x) look bit cleaner then original and it should give a good fps boost on older pc’s.
You can run the x2 ones even with just 2gb vram but expect sutters. I would advice doing (x2) only if you got 4gb or more.
You can also combine them if you know how… like per example use terrain x2 and creatures x1 or x0.5 in case get sutters when alot of enemies spawn. if you playing at 1080p you will barely notice the diference between x1 and x2 anyways
reshade
Home (reshade.me)
I would post my reshade preset but i dont think its finished if it ever will and you prolly can find better ones out there, or make your own its not too hard to start learning on how to use it.
have fun
I will keep working on my and keep playing this amazing game
Im trying to get that realism feel to it but its so hard with just reshadings and not eat my fps 
in game max settings with post processing on / backed up fog, no reshade.
in game max settings with post processing off /backed up fog, with reshade
bit too sharp maybe dunno what you guys think :P?
adding new ambient oclusion… in game one is so subtle when using my reshade preset
in game options AO off…
in game options AO on
in game option AO off, new AO shader…
in game options AO off…
in game options AO on
in game option AO off, new AO shader
