"This plugin for Fallout 4 adds an ability to dynamically control shadow draw distance depending on desired user defined fps.
Many of you may have noticed that in some locations of Fallout 4 fps gets low even with a good hardware, like in the City, mostly it happens in the
areas with lots of objects. Since the game isn't properly optimized, almost everything that it does with objects which it renders takes more time than
it actually should. One of the most time consuming operations in Fallout 4 is shadow rendering and because the game has only predefined shadow draw
distance, which applies everywhere in every location just the same, we have a choise either we set it to high value with having a good picture but
eventually facing fps drops in locations with lots of object or we lower the value to make fps more stable in general. And this is exactly the point
where this plugin comes handy!"
FPS dynamic shadows - Shadow Boost at Fallout 4 Nexus - Mods and community