CensoredASM is one of the most impactful mods in this guide; it aims at reducing the ram usage of Minecraft, making it faster and reducing the ram usage up to 4 times on big modpacks. It also prevents the game from crashing, and fixes bugs
Require MixinBooterVintageFix is a better and updated version of FoamFix, it aims at reducing the ram usage of Minecraft and reducing tps usage by doing networking optimization and fixing bugs. It also does other more minor optimizations.
Require MixinBooterAlfheim is a fork (or a rewrite depending on your views on the ship of theseus) of Hesperus which is a fork of Phosphor. It aims at optimizing the lighting parts of Minecraft by entirely replacing the lighting engine, it results in improved fps and improved world generation speed.
Sledgehammer aims at smashing out the stupid out of the client and the server, by optimizing and cleaning up client and server code. It speeds up and improves connection to servers, reduces network usage. It also prevents crashes, fixes bugs and quality of life improvement.
Require MixinBooter
Universal Tweaks aims at superseding tweaking, bug fixing, and small performance mods; it also improves performance in new unique ways.
All of its tweaks can be turned on or off.
Starting with version 1.8 Universal Tweaks includes the entirety of the DupeFix Project.
Fixeroo aims at reducing the lag on server for some specific things. It greatly optimizes XP orbs by clumping them together, but unlike the Clumps mod, it does not create a new entity. It also do some optimization to golem building.
Entity Culling aims to optimize rendering of entity and tile entity by skipping the rendering of those that are hidden.
Entity Culling only improves FPS when you have a lot of entities on screen, otherwise it decreases FPS so only install it when entities make you lag.
Not included in Opticraft instance.
Require MixinBooter Require RenderLibNothirium aims to optimize rendering of chunks by rewriting the chunk rendering engine, which greatly increases performance.
Not included in Opticraft instance.
Require MixinBooter Require RenderLib Incompatible with Cubic Chunks Incompatible with Little Tiles Incompatible with Far Plane Two Causes artifacts with Multiblocked multiblocksOptifine aims to optimizing client-side operations and generally making it faster. It also adds support for shaders and more.
Not included in Opticraft instance.
Particle Culling aims to optimize rendering of particles by skipping the rendering of those that are hidden.
Dynamic View aims to optimize server view distance by reducing it when the server lags and increasing it when the server has spare performance.
Not included in Opticraft instance.
McMouser aims at fixing bugs with mouse on Mac Minecraft.
Not included in Opticraft instance.
NetherPortalFix aims at fixing the bug where when taking the same nether portal, you end up somewhere else in the overworld.
Not included in Opticraft instance.