FPS Enhancer
Culls redundant entities to preserve precious CPU cycles for more important entities like bosses, players, and enemies.
This game is not bottlenecked by your GPU, ever. Everything is reliant on your CPU. If you have a great deal of content mods running update functions on entities at the same time, it makes your freaking game slow. (assuming these functions are large)
By removing things from the game, it prevents these update functions from ever being triggered, as theres no entity to update in the first place.