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ModernFix

By embeddedtOwner

0.5★ 2.5★ 5★

All-in-one mod that improves performance, reduces memory usage, and fixes many bugs. Compatible with all your favorite performance mods!

No Theme No Genre QoL & Tweaks Performance & Optimization Server Utility Client Utility

Mod Loaders

Forge NeoForge Fabric

Minecraft

Shockbyte server hosting: 35% off your first server with code MODDEX35

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Any 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

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hrs+

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5.0

Performance Improvements for Free?!

Puppydaze

Reputation ranks

Explorer 0 pts

Contributor 100 pts ←

Guide 500 pts

Veteran 1,500 pts

Luminary 4,000 pts

Ranks only ever go up; points can drop but your rank stays.

About reputation ranks

Total 1,000 hrs MC 1.20, 1.2… MC 1.20, 1.21

Performance

5.0

This mod does a great job at improving the performance of modpacks, or just Minecraft in general, through the usage of tweaks that have been proven to work well. A must have for anyone who has a slower computer or a very large modpack! Very little reason to ever depart from using this. I've been sure to install this whenever it's missing to gain the boost in performance and stability through all my playthroughs!

5.0

Puppydaze

Reputation ranks

Explorer 0 pts

Contributor 100 pts ←

Guide 500 pts

Veteran 1,500 pts

Luminary 4,000 pts

Ranks only ever go up; points can drop but your rank stays.

About reputation ranks

Total 1,000 hrs MC 1.20, 1.2… MC 1.20, 1.21

5.0

Just fixes things, what's not to like?

Auseawesome

Reputation ranks

Explorer 0 pts

Contributor 100 pts

Guide 500 pts

Veteran 1,500 pts ←

Luminary 4,000 pts

Ranks only ever go up; points can drop but your rank stays.

About reputation ranks

ModDex staff Tag Curator

Reviews community tag suggestions and keeps project genres, themes, and features accurate.

This review is their own opinion. Staff reviews follow the same guidelines and moderation as everyone else's.

Meet the team

Total 500 hrs MC 26.1, 1.2… MC 26.1, 1.21, 1.20

Performance

5.0

I've never had any issues or crashes from this mod and the patches and performance improvements can really help, especially when making modpacks.

This is a mod that I add to every pack I make now because there's no reason not to include it and I highly recommend it to other pack users.

For end users, you can install this mod if you want but there's a very small chance it breaks other mods in packs so be careful if you don't know what you're doing

5.0

Auseawesome

Reputation ranks

Explorer 0 pts

Contributor 100 pts

Guide 500 pts

Veteran 1,500 pts ←

Luminary 4,000 pts

Ranks only ever go up; points can drop but your rank stays.

About reputation ranks

ModDex staff Tag Curator

Reviews community tag suggestions and keeps project genres, themes, and features accurate.

This review is their own opinion. Staff reviews follow the same guidelines and moderation as everyone else's.

Meet the team

Total 500 hrs MC 26.1, 1.2… MC 26.1, 1.21, 1.20

5.0

An amazing perfomance and bugfix mod

Precise-ModPacker

Reputation ranks

Explorer 0 pts

Contributor 100 pts ←

Guide 500 pts

Veteran 1,500 pts

Luminary 4,000 pts

Ranks only ever go up; points can drop but your rank stays.

About reputation ranks

MC 1.16, 1.1… MC 1.16, 1.19

Gameplay

5.0

Aesthetics

5.0

Performance

5.0

A very good mod that improves perfomance and loading times.

I personally notice a significant improvement in the loading time of multiple modpacks worlds.

I used it in 1.16.5 & 1.19.2 and it worked well in both of them.

5.0

Precise-ModPacker

Reputation ranks

Explorer 0 pts

Contributor 100 pts ←

Guide 500 pts

Veteran 1,500 pts

Luminary 4,000 pts

Ranks only ever go up; points can drop but your rank stays.

About reputation ranks

MC 1.16, 1.1… MC 1.16, 1.19

Get it on

Available Platforms

CurseForge

Modrinth

Compatibility

Supported Environments

Where It Runs

Either Side, Better on Both

Works on the client or the server alone, but does more when on both.

About

Project Details

Type

Mod

License

GNU Lesser General Public License v3.0 only

Latest Version

modernfix-forge-5.27.88+mc1.20.1.jar

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Identifiers

Platform IDs

CurseForge ID

Modrinth ID

Resources

External Links

Source Issues Wiki Discord

About

Description

Banner image

Available for Fabric Available for Forge

ModernFix is an all-in-one mod that improves performance, reduces memory usage, and fixes many bugs in modern Minecraft versions (most versions including and above 1.16 are supported) without majorly compromising the game experience. Most Forge 1.16-1.19.2 modpacks will launch roughly twice as fast with ModernFix installed. If some non-default options are enabled, it can even allow large modpacks like All The Mods 8 to run with 3GB or less of allocated memory.

ModernFix is free, open-source software. All of the code is available on the GitHub repository.

⚙️ Technical summary

What exactly does ModernFix do for your game? There are a lot of tweaks being made - too many to summarize here. However, here is a brief summary of the general types of improvements being made:

Backports of bugfixes from newer versions of Minecraft and/or Forge, e.g. fixing worlds breaking when you remove a dimension mod in 1.18.
Patches to mods that are no longer supported on a given Minecraft version, to improve the gameplay experience instead of requiring players to update.
Many optimizations & improvements to the game's launch process to significantly improve speed and reduce random concurrency crashes.
Additional debug tools to help modders and players determine the cause of some rare game crashes/freezes, instead of relying on a painful mod bisection process.
It's not enabled by default due to compatibility issues, but ModernFix includes functionality to completely redesign the game's model loading system, replacing it with a new, dynamic version that loads models on the fly. Model loading is one of the major performance regressions to modded Minecraft that has been present since 1.8, and this new system alleviates nearly all of the downsides, bringing memory usage and loading times more in line with how they were in 1.7.10.
Need to play the vanilla game with very little RAM allocated (e.g. 512MB or less)? Now you can do that. Head to the "Ultra-Low Memory Footprint" page on the wiki.

If you are technically savvy and looking for more details on each patch, I recommend reading the Summary of Patches wiki page.

🐛 Where to go when something doesn't work

Please either report an issue on GitHub, or join the Discord and ask in the #modernfix-discussion channel. Be sure to mention the Minecraft version, modloader, and ModernFix version you are using, as well as what other mods you have installed.

🎁 How can I support this project?

There are two main ways you can help support the development of ModernFix:

Spread the word! Test ModernFix in modpacks and encourage them to include it.
If you feel generous, I do accept donations via Ko-fi. Donating is not required (as ModernFix is free), but every little bit helps. I work on ModernFix in my spare time, so any compensation I receive helps to sustain development.

❓ What other mods should I use?

There are many performance mods available for Minecraft and I can't list them all here, but here are some essential mods, in my opinion:

On any version before 1.19.4 you should always have LazyDFU installed, as it eliminates the incredible lag caused by the DFU system.
On any version before 1.20 you should generally use Starlight unless it has a compatibility issue with your mods (which is quite rare). It offers vastly improved lighting performance and can also fix FPS stutters when moving between chunks.
Always have FerriteCore installed, as Mojang's implementation of blockstates/models is laughably inefficient, and quickly consumes RAM as soon as more content is added beyond what vanilla offers.
Install a mod like Shutup Experimental settings (before 1.19) or Yeetus Experimentus (1.19+). These mods will suppress the pop-up screen about experimental game features, which otherwise causes the game to reload its resources twice.

On a related note: I do not recommend use of OptiFine in any modded scenario. It is closed-source, patches the game in a way that easily breaks Forge and other mods, and significantly slows down game launching, often on the order of minutes. Please consider using Sodium (on Fabric) or Embeddium (on Forge) instead. Using OptiFine with ModernFix is not officially supported, and may cause issues.

Need a Minecraft server? Consider CreeperHost!

Use code taumc-qk0 for 10% off

Banner image

ModernFix is free, open-source software. All of the code is available on the GitHub repository.

⚙️ Technical summary

What exactly does ModernFix do for your game? There are a lot of tweaks being made - too many to summarize here. However, here is a brief summary of the general types of improvements being made:

Backports of bugfixes from newer versions of Minecraft and/or Forge, e.g. fixing worlds breaking when you remove a dimension mod in 1.18.
Patches to mods that are no longer supported on a given Minecraft version, to improve the gameplay experience instead of requiring players to update.
Many optimizations & improvements to the game's launch process to significantly improve speed and reduce random concurrency crashes.
Additional debug tools to help modders and players determine the cause of some rare game crashes/freezes, instead of relying on a painful mod bisection process.
It's not enabled by default due to compatibility issues, but ModernFix includes functionality to completely redesign the game's model loading system, replacing it with a new, dynamic version that loads models on the fly. Model loading is one of the major performance regressions to modded Minecraft that has been present since 1.8, and this new system alleviates nearly all of the downsides, bringing memory usage and loading times more in line with how they were in 1.7.10.
Need to play the game with very little RAM allocated (e.g. 512MB or less)? Now you can do that.

If you are technically savvy and looking for more details on each patch, I recommend reading the Summary of Patches wiki page.

🐛 Where to go when something doesn't work

🎁 How can I support this project?

There are two main ways you can help support the development of ModernFix:

Spread the word! Test ModernFix in modpacks and encourage them to include it.
If you feel generous, I do accept donations via Ko-fi. Donating is not required (as ModernFix is free), but every little bit helps. I work on ModernFix in my spare time, so any compensation I receive helps to sustain development.

❓ What other mods should I use?

There are many performance mods available for Minecraft and I can't list them all here, but here are some essential mods, in my opinion:

On any version before 1.19.4 you should always have LazyDFU installed, as it eliminates the incredible lag caused by the DFU system.
On any version before 1.20 you should generally use Starlight unless it has a compatibility issue with your mods (which is quite rare). It offers vastly improved lighting performance and can also fix FPS stutters when moving between chunks.
Always have FerriteCore installed, as Mojang's implementation of blockstates/models is laughably inefficient, and quickly consumes RAM as soon as more content is added beyond what vanilla offers.
Install a mod like Shutup Experimental settings (before 1.19) or Yeetus Experimentus (1.19+). These mods will suppress the pop-up screen about experimental game features, which otherwise causes the game to reload its resources twice.

On a related note: I do not recommend use of OptiFine in any modded scenario. It is closed-source, patches the game in a way that easily breaks Forge and other mods, and significantly slows down game launching, often on the order of minutes. Please try Sodium (on Fabric) or Embeddium (on Forge) instead! Using OptiFine with ModernFix is not officially supported, and may cause issues.

🖥️ Need a Minecraft server? Consider CreeperHost!

Use code taumc-qk0 for 10% off

Versions

Files

On ModDex

Community snapshot

Ratings

Followers

In stacks

By the numbers

Statistics

37,614

Modpacks using this mod

328.2m

Total Downloads

CurseForge

246.7m

Modrinth

81.4m

Oct 11, 2026

Last Updated

CurseForge

Oct 11, 2026

Modrinth

Oct 11, 2026

Jan 5, 2023

Created

CurseForge

Jan 5, 2023

Modrinth

Apr 16, 2023

1 day ago

Last synced

When ModDex last fully re-synced this project from CurseForge or Modrinth. A new file release triggers one, usually within minutes, and every project is also re-synced on a schedule. Edits that ship no file, such as a new description or screenshots, are checked for every few hours and can appear before this date changes.

New file updates sync automatically

How syncing works

Get it on

Available Platforms

CurseForge

Modrinth

On ModDex

Community snapshot

Ratings

Followers

In stacks

By the numbers

Statistics

37,614

Modpacks using this mod

328.2m

Total Downloads

CurseForge

246.7m

Modrinth

81.4m

Oct 11, 2026

Last Updated

CurseForge

Oct 11, 2026

Modrinth

Oct 11, 2026

Jan 5, 2023

Created

CurseForge

Jan 5, 2023

Modrinth

Apr 16, 2023

1 day ago

Last synced

New file updates sync automatically

How syncing works

Resources

External Links

Source Issues Wiki Discord

ModernFix

Reviews

Filters

Performance Improvements for Free?!

Performance Improvements for Free?!

Just fixes things, what's not to like?

Just fixes things, what's not to like?

An amazing perfomance and bugfix mod

An amazing perfomance and bugfix mod

Available Platforms

Supported Environments

Project Details

Embed Badge

Platform IDs

External Links

Description

⚙️ Technical summary

🐛 Where to go when something doesn't work

🎁 How can I support this project?

❓ What other mods should I use?

Need a Minecraft server? Consider CreeperHost!

⚙️ Technical summary

🐛 Where to go when something doesn't work

🎁 How can I support this project?

❓ What other mods should I use?

🖥️ Need a Minecraft server? Consider CreeperHost!

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Files

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Community snapshot

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Available Platforms

Community snapshot

Statistics

External Links