Reduced Visuals

Features 

Smart Leaves

This makes leaves render less block faces by making some of it opaque. When all the sides of a leaves is covered, it makes the leaves inside opaque; kinda like a block culling thing

One-Sided Texture Model

This makes the entities render less faces/texture by removing the inside texture of a model or what we call backface culling(may cause some entity model see-through and some not applied)

Fog/Entity Limiter

This makes entities render less by making the fog near to the players view(this is changeable on the subpacks menu and it's set on default)

Minimized Particles

This makes particles emits less by reducing and limiting the amount of it(some not applied)