Updates for 1.3:
- Changed FOV slider step from 5 to 1.
- The minimum limit for dynamic and static resolution settings has been increased.

Unlock Hidden Graphics Settings With Increased FOV - Mouse sensitivity - Zoom sensitivity - Resolution scale limit

Enables Global Illumination Settings.
Unlocks:
Local Shadow Mesh Quality: Off-Low-Medium-High-Ultra-Psycho
Cascaded Shadows Range: Off-Low-Medium-High-Ultra-Psycho
Cascaded Shadows Resolution: Off-Low-Medium-High-Ultra-Psycho
Local Shadows Quality: Off-Low-Medium-High-Ultra-Psycho
Distant Shadows Resolution: Off-Low-Medium-High-Ultra-Psycho
Volumetric Fog Resolution: Off-Low-Medium-High-Ultra-Psycho
Volumetric Clouds Quality: Off-Low-Medium-High-Ultra-Psycho
Max Dynamic Decals: Off-Low-Medium-High-Ultra-Psycho
Subsurface Scattering Quality: Off-Low-Medium-High-Ultra-Psycho
Ambient Occlusion: Off-Low-Medium-High-Ultra-Psycho
Global illumination: Off-Low-Medium-High-Ultra-Psycho
Color Precision: Off-Low-Medium-High-Ultra-Psycho
Mirror Quality: Off-Low-Medium-High-Ultra-Psycho
Level Of Detail (LOD): Off-Low-Medium-High-Ultra-Psycho
FOV: maximum 150
Mouse sensitivity: Maximum 50
Zoom sensitivity: Maximum 5
Rsolution scale: Maximum 300

Installation:
First make a backup of your original "options.json" inside r6/config/settings/platform/pc/
Then extract and replace it with the moded "options.json" 
 Officially, we don't know how many changes in visual and performance these still make.
You must test yourself, therefore.
If you set everything to psycho rather than ultra, the performance of the game increases without a noticeable visual change.

Credits:
srgamerio