Forge Mods for Minecraft Java
Browse 1,655 free Forge mods for Minecraft Java — popular picks include Clumps, Dimensional Threading Reforked, Concentration.
Step by step: How to install Minecraft Java mods & modpacks
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Clumps
Merge experience orbs and instant pickup experience orbs to reduce lag!
Dimensional Threading Reforked
Optimizes all your server dimensions distributing the load on multiple threads

Concentration
Borderless fullscreen support for Minecraft 1.20.6+
Weather Refined
Replaces vanilla rain & snow with improved, more polished particles. Less visual clutter, more atmosphere.
Angelica
Rendering Overhaul and Optimization - Improve your FPS
Async Logger
Asynchronous logging and efficient filtering - performance improvements and utility for keeping your logs clean
MoreMcmeta (Forge)
Animate almost any Minecraft texture with JSON and OptiFine files. Texture configuration API. 1.16-1.21
Fast Recipe Search
Significantly speed up recipe search.
Enchanter Fix
Allows players to decorate their enchanting table setup by fixing the "enchantment power transmitter" block tag.
Overworld Two (Forge)
An optimization mod that generates the overworld(and nether too) much faster than Vaniila!

FermiumMixins
General purpose Minecraft and Minecraft mod tweaker and fixer
Graphene
A powerful and freely open-source optimization mod for Minecraft 1.12.2+, which fixes some issues in Minecraft and greatly improves its performance. It can replace many mods and all functions can be configured in the configuration file!
Fast NBT
Speed up all kinds of NBT operations and improve game performance
ThreadTweak Reforged
Improve and tweak Minecraft CPU scheduling (again!)
Put A Plug In it! (PAPI)
A small mod that fixes Memory Leak issues, optimizes Memory Usage, and increases version/loader support for features of other Memory Leak Fix/Memory Optimization mods
Draconic Evolution Render Patcher
Fix render issues between Draconic Evolution and Embeddium/Sodium
MoreMcmeta Emissive Textures (Forge)
Emissive textures with JSON and OptiFine files. 1.16-1.20
Redirectionor [Retro]
Avoid Enum values allocation in codes and improve game performance.
燐/Hesperus
Lighting optimization mod
Thaumic Speedup
Speeds up Thaumcraft's loading process and optimizes internals.
OptiFine Checker
Check if OptiFine HD is loaded
Divine Journey 2 Addons
Mixins and mod tweaks for the Divine Journey 2 modpack.
MoreMcmeta Emissive Textures
Emissive textures with JSON and OptiFine files. 1.16-1.20
Integrated Derivative
Smash the stupid out of Integrated Dynamics and its addons
Optifine Capes
For those who are only interested in the optifine capes.
QuickQuark
Provide multiple ways to boost the initialization speed of Vazkii's Quark mod.
EfficientHashing
better hashing algorithm for Vec3i & BlockPos
RPMTW Platform
The mod integrated with RPMTW services covers translation, wiki, universe chat, Chinese input optimization, and other features for Minecraft players to get a better gaming experience.

RS Integration
A major core optimization release featuring improved recursive crafting scheduling, recipe-index warm-up, safer transaction settlement, rewritten pinyin search, and optional Project MMO salvage integration.
OptiFine CIT Enchantment Patch
Fixes a small bug in OptiFine with enchantment CITs when enchantment names arent found
Datapack Load Error Fix
A comprehensive Minecraft world repair utility that fixes common issues caused by removed mods and datapacks.
Optifine Check
Displays a reminder if optifine is not installed
Idle Boost
This mod optimizes performance when Minecraft is running in the background.
Revamp
Rivvest's Enhanced Villager and Mob Performance
EnlightenedBlockEntities
Unofficial fork of enhanced block entities(EBE). Since 0.5 Also fix AO like in Fabric-Indigo. Compatible with Embeddium.
FastSpawner
Dynamically optimizes mob spawner rendering for maximum FPS - display entities only when ⇧ Shift is held, and particles at adjustable rates. Perfect for lag-free mob farms!