This mod is a fork of Magnesium Extras but has had bug fixes to solve some crashes and has also had some features stripped out that were extraneous or problematic for many common use cases.

The original mod can be found here https://www.curseforge.com/minecraft/mc-mods/magnesium-extras.

This mod has similar functionality but removed the experimental chunk updating, borderless window mode, chunk fade in and alternate FPS counter

Current features from the original mod (+Fixes) include:

Zoom key! A port of "Ok Zoomer" from Fabric, bound to C, allows you to view far away objects more easily.
True Darkness. Has options to make night time & caves realistically dark. Can be configured or turned off.
Entity Culling. Improve performance in modpacks drastically by not rendering far away entities. Includes a configurable Y value so you can disable rendering mobs in caves while you're on the surface. Can be configured or disabled. Incompatible with Out Of Sight, because that mod does the same thing, and doesn't support Sodium anyway.
Configurable Cloud Height. Vanilla clouds are quite low, and there's no other mod to raise them on Forge. This mod defaults them to being a bit higher.
Integration With Magnesium/Rubidium Dynamic Lights. This mod works perfectly with MDL, and improves its performance drastically with its optimizations. If you have MDL, you'll want to install this mod.

As a closing note, you can freely use this mod in your pack but if the original Magnesium Extras mod has the bugs fixed at a future time, please use the original mod to give the original author credit where due. If you run into issues report to the tracker linked on the issue tab.

Milk of Magnesium