ArchaicFix implements a number of bugfixes and optimizations for Minecraft 1.7.10. Please see the README on GitHub for a more complete list, but here are a few highlights:
- Removes/reduces the infamous client-side stuttering in 1.7.10, particularly in biomes with many light updates like jungles
- Backport of the Phosphor lighting engine (the original repository is no longer available, this link leads to my 1.12 fork which is the closest to the original, and still has the original branch)
- Many other fixes for various vanilla issues
Additionally, ArchaicFix patches a few common annoyances in other mods.
Newer versions of ArchaicFix require a GTNHMixins-compatible mixin loader like UniMixins to be installed.

Quick facts
- Edition: Minecraft Java
- File type: .jar
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
ArchaicFix is a free Minecraft Java mod. Downloaded 847,119 times (via CurseForge). Download it and open it directly in the game.