Hi guys, sorry for my english!
I saw that there is no guide in the steam hub about this tool so I decided to share my experience with you.

The purpose of this guide is to significantly improve the graphics and immersion of the game .
If you do not believe me you can see the pictures and the video below.

For do that you need this simple tool...Reshade https://reshade.me/
To download the program go to the site and click on download. Download the latest version 3.0.8 and start it. Once started, you are prompted to select the game folder, search for the path (C:\Program Files(x86)\Steam\ steamapps\common\Divinity Original Sin 2 \ bin) and select the game's exe file (is the bigger one).
Once confirmed, click on Direct3D 10+. Click on yes and the program start download the various effects.
Now you can choose the effects that you prefer, to know what they change I invite you to see the various guides you can find on internet.
If you want graphics similar to mine these are the effects to select.
Click on Uncheck All and select these effects:

• Ambient Light
  
• Clarity
  
• Colorfulnes
  
• DPX
  
• Emphasize
  
• HDR
  
• Magic Bloom
  
• MXAO
  
• Reflective Bumpmapping
  
• Technicolor
  
• Technicolor 2
  
• Vibrance

Select it and press ok.
Now download my settings and put them in the same folder where Reshade is installed(where is the game exe).
h ttps:/mega.nz/#!gWYyGShb!uSqLat2iDoBcrIi4cPt4wmqTsXq3ZyPc9abF5G05XJI

Start the game, once loaded, press SHIFT + F2 select my preset and it is done. Now enjoy the game!
For a optimal gameplay reduce the brightness.
This tool hit the performance and my preset to! I play on 3440x1440 on all ultra ( No motion blue) and without i have 85-90 fps, with this 45-50, maybe if you play at low resolution the fps lost are less!
If you have more then 30 fps it's ok!

I hope this guide has been useful to you! Share it and subscribe!
See you!

The first picture is without reshade, the second with the program.