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QuantuMiz
Your yet-another optimization & improvement modpack, now powered with 100% FOSS mods!
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QuantuMiz is the optimization and improvement modpack which provides the best Vanilla Minecraft experience by optimizing and improving the game, with the power of 100% FOSS mods.
Changelog
See here.
Features
- Focused on optimizing and slightly improving the base game as many as possible!
- Partial compatibility of OptiFine features such as Connected Textures and Shaders!
- 100% community-made, free and open-source! All mod's source code are available on their respective GitHub page.
List of mods
List of mods can be found here.
Derivatives/Editions
We also have various official derivative of QuantuMiz (A.K.A Editions), which is designed for specific purposes.
- QuantuMiz: Competitive Edition (QuantuMiz CE): A modpack optimized for PvP gaming for various community servers, displaying useful information and highly customizable features.
Using this modpack on your livestream/contents
You are free to use this modpack on livestream and contents as this modpack is MIT License! But I would be grateful if you leave a link to this modpack.
Thank you for supporting this modpack project!
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[v4.2.0-beta.2] 4.2.0-beta.2 for MC 26.3
by RoonMoonlight on Oct 17, 2026
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> **Notice: This is pre-release.** All contents included on pre-release are subject to change, and may contain bugs/glitches.
We are getting closer to final release!
## What's new
We are getting closer to final release!
## What's new
- Re-added Language Reload
- Updated C2ME, e4mc, Fabric API
- Unavailable mod(s): Cubes Without Borders
[v4.1.6] 4.1.6 for MC 26.2
by RoonMoonlight on Oct 17, 2026
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This update introduces some backports that couldn't be added back in 1.21.x era. Enjoy the update!
## What's new
## What's new
- Added back e4mc, FastQuit, ImmediatelyFast (Backported from 26.3 beta 1 update)
- Updated C2ME, Controlify, Debugify, Fast Noise, Language Reload, Mod Menu, No Chat Restrictions
[v4.2.0-beta.1] 4.2.0-beta.1 for MC 26.3
by RoonMoonlight on Oct 17, 2026
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> **Notice: This is pre-release.** All contents included on pre-release are subject to change, and may contain bugs/glitches.
Hey all, sorry for late update, was working on something important ~~and playing games~~.
This also fixes issue related to crash when opening YACL configuration file. If you are affected, please update the mod as soon as possible.
We have been seeing people catching a cold since this September. Please make sure to take care of yourself, be hydrated, and be healthy!
Hope you enjoy the update.
## What's new
Hey all, sorry for late update, was working on something important ~~and playing games~~.
This also fixes issue related to crash when opening YACL configuration file. If you are affected, please update the mod as soon as possible.
We have been seeing people catching a cold since this September. Please make sure to take care of yourself, be hydrated, and be healthy!
Hope you enjoy the update.
## What's new
- Added back e4mc, FastQuit, ImmediatelyFast
- Re-added Controlify, Debugify, No Chat Report, No Chat Restrictions
- Updated Cloth Config, C2ME, Fast Noise, Iris, Ixeris, Lithium, Mod Menu, ModernFix, Reese's Sodium Options, Renice Shot
- Controlify: Fixes crash when rendering button guide where the player's game mode is unknown to the client
[v4.2.0-alpha.1] 4.2.0-alpha.1 for MC 26.3
by RoonMoonlight on Oct 17, 2026
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> **Notice: This is pre-release.** All contents included on pre-release are subject to change, and may contain bugs/glitches.
> **WARNING:** This version has No Chat Report mod disabled, and using this version while connected to server **may be affected with built-in Chat Report feature from Mojang**. Proceed with your own risk.
Welcome to the first alpha release of QuantuMiz series! This update will have several new features, as the Vanilla 26.3 does.
The codename for this version is 'Teresa', named after minor planet No. 11350.
## What's new
> **WARNING:** This version has No Chat Report mod disabled, and using this version while connected to server **may be affected with built-in Chat Report feature from Mojang**. Proceed with your own risk.
Welcome to the first alpha release of QuantuMiz series! This update will have several new features, as the Vanilla 26.3 does.
The codename for this version is 'Teresa', named after minor planet No. 11350.
## What's new
- Rebased MC version and related configuration to 26.3 (Wilderness Bound)
- Advanced Item Tooltip is now enabled by default
- Updated most of the mods to latest release
- Updated Sodium to 0.9.2
- ~~The game now runs in Borderless Windowed mode by default on first-run~~ (Not applicable on this version as CWB is still working on 26.3 support)
- Re-Added ModernFix with mVUS fork which is continuation of Fabric releases (May use original ModernFix occassionally if official version becomes available)
- Added BetterGrassify, one of the most essential feature that was removed in the past release
- Note: Better Grass feature is disabled by default and must be enabled in settings
- Added Ixeris, providing raw input and threaded event polling optimizations
- Added Renice Shot, providing high-quality screenshot that Vanilla MC does not have
- Replaced unmaintained MixinTrace with fork MixinTrace Reborn, which now provides support for 26.1 and above
- Removed restrictive license mod 'Crash Assistant', which does not comply with our current policy of mod addition
- Unfortunately, there was no equivalent alternatives of it so we will keep it removed just like 3.5.x and below
- Cleaned-up some configuration files
- Unavailable mods: Cubes Without Borders, Debugify, Language Reload, No Chat Report, No Chat Restrictions
[v4.1.5] 4.1.5 for MC 26.2
by RoonMoonlight on Oct 17, 2026
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Definitely not a small update
## What's new
## What's new
- Updated C2ME, Controlify, Fabric API, Iris, Mod Menu, Reese's Sodium Options, Sodium, Sodium Extra, YetAnotherConfigLib
- Updated Sodium to 0.9.2, including a new terrain buffer allocation system, tons of improvement and bug fixes
- The game now runs in Borderless Windowed mode by default on first-run
- Removed restrictive license mod 'Crash Assistant', which does not comply with our current policy of mod addition
- Unfortunately, there was no equivalent alternatives of it so we will keep it removed just like 3.5.x and below
- Cleaned-up some configuration files
[v4.1.4] 4.1.4 for MC 26.2
by RoonMoonlight on Oct 17, 2026
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## What's new
- Added dependency mod ZConfig as Fast Noise now requires it
- Updated Fabric Loader to 0.19.5
- Updated Controlify, Fabric API, Fast Noise
- Temporarily reverted Sodium to 0.9.1 due to compatibility issue with Iris Shaders
[v4.0.5] 4.0.5 LTS for MC 26.1.2
by RoonMoonlight on Oct 17, 2026
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> Notice
>----
> 4.0.x-26.1.2 branch is now on Long-Term Support phase. Limited support may be provided until July 17, 2027, and new update will be posted every 8 weeks.
## What's new
>----
> 4.0.x-26.1.2 branch is now on Long-Term Support phase. Limited support may be provided until July 17, 2027, and new update will be posted every 8 weeks.
## What's new
- Updated Fabric Loader to 0.19.5
- Updated BBE, C2ME, Controlify, Crash Assistant, Fabric API, Iris, Lithium, Mod Menu, No Chat Restrictions, Reese's Sodium Options, Sodium, Sodium Extra, YetAnotherConfigLib
- Temporarily reverted Sodium to 0.9.1 due to compatibility issue with Iris Shaders
[v4.1.3] 4.1.3 for MC 26.2
by RoonMoonlight on Oct 17, 2026
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Maybe considered a (not too much but) major update. Yee-haw!
## What's new
## What's new
- Updated C2ME, Crash Assistant, Fabric API, Fast Noise, No Chat Reports, No Chat Restrictions
- C2ME: Enabled enableNvidiaFastCompilation by default
- Crash Assistant: Added persistent mod-list history, filterable and sortable two-pane mod-list history browser,
- NoChatReport: Fixed crash on Vulkan and server ping
- And some bug fixes and improvements
- Temporarily reverted Sodium to 0.9.1 due to compatibility issue with Iris Shaders
[v4.1.2] 4.1.2 for MC 26.2
by RoonMoonlight on Oct 17, 2026
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Just a 'very' minor update after the series of SSD incident.
## What's new
## What's new
- Updated C2ME, Controlify, Fabric API
- Temporarily reverted Sodium to 0.9.1 due to compatibility issue with Iris Shaders
[v4.1.1] 4.1.1 for MC 26.2
by RoonMoonlight on Oct 17, 2026
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We had an SSD issue, but we are now back, safe and clean! Sorry for the late update.
## What's new
### QuantuMiz
### QuantuMiz CE
## What's new
### QuantuMiz
- Updated BBE, C2ME, Controlify, Disable Compliance Notification, Fabric API, Fast Noise, Lithium, Sodium, YetAnotherConfigLib
- Removed temporary overrides for Disable Compliance Notification
- Temporarily reverted Sodium to 0.9.1 due to compatibility issue with Iris
### QuantuMiz CE
- Updated Animatium, BBE, C2ME, Controlify, Disable Compliance Notification, Fabric API, Fabric Language Kotlin, Fast Noise, Gamma Utils, Lithium, OneConfig, Sodium, TipTapShow, YetAnotherConfigLib
- Removed temporary overrides for Disable Compliance Notification
- Temporarily reverted Sodium to 0.9.1 due to compatibility issue with Iris
[v4.1.0] 4.1.0 for MC 26.2
by RoonMoonlight on Oct 17, 2026
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Welcome to 4.1.0! This is QuantuMiz Sara, for Minecraft 26.2. We hope you enjoy the new update.
## What's new
## What's new
- Rebased MC version to 26.2 and updated most of mods to latest release
- Added Fast Noise, a continuation and better alternatives to Noisium which has been discontinued
- Amacs has been removed starting with 26.2 as we determined that the mod only provides more bloats than we expected and may be considered as unfair advantage for some servers
- Cleaned up some bugfixes (MC-89146 and MC-263865)
- Cleaned up some unused configuration files and unnecessary keybinds
- Disabled Banner Optimization and experimental stuffs on Better Block Entities
[v4.0.4] 4.0.4 LTS for MC 26.1.2 (404 Not Found)
by RoonMoonlight on Oct 17, 2026
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> Caution: 4.0.x for MC 26.1.2 branch is now on Long-Term Support phase. Limited support may be provided until July 17, 2027, and new update will be posted every 8 weeks.
## What's new
## What's new
- Updated BBE, C2ME, Controlify, Crash Assistant, Fabric API, Iris, Mod Menu, Reese's Sodium Options, Sodium, Sodium Extra
[v4.1.0-beta.1] 4.1.0-beta.1 for MC 26.2
by RoonMoonlight on Oct 17, 2026
Download
> **Notice: This is pre-release.** All contents included on pre-release are subject to change, and may contain bugs/glitches.
## What's new
## What's new
- Updated C2ME, Lithium, Reese's Sodium Options, Sodium, Sodium Extra
- Note: Sodium has been downgraded to 0.9.0 due to dependencies not meeting the Sodium version
- Reese's Sodium Options: Redesigned Sodium Options, Better Keyboard and Controller Navigation, QoL fixes
- Re-added No Chat Report & No Chat Restrictions
[v4.0.3] 4.0.3 for MC 26.1.2
by RoonMoonlight on Oct 17, 2026
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NOTE: Sodium and related mods has NOT been updated due to Iris Shaders has stopped updating for 26.1 branch.
## What's new
## What's new
- Updated C2ME, Fabric API
- Fixed wrong version info on Main Menu
[v4.1.0-alpha.2] 4.1.0-alpha.2 for MC 26.2
by RoonMoonlight on Oct 17, 2026
Download
> **WARNING:** This version has No Chat Report mod disabled, and using this version while connected to server **may be affected with built-in Chat Report feature from Mojang**. Proceed with your own risk.
> **Notice: This is pre-release.** All contents included on pre-release are subject to change, and may contain bugs/glitches.
## What's new
> **Notice: This is pre-release.** All contents included on pre-release are subject to change, and may contain bugs/glitches.
## What's new
- Updated C2ME, Fabric API, Fast Noise, Mod Menu, Reese's Sodium Options, YetAnotherConfigLib
- Re-added Cubes Without Borders, Debugify, Language Reload
- Further optimizations and changes was made for default options.txt, aiming to make optimization while not making graphic look bad
- Disabled VSync by default - You may enable it manually on Video Settings
- Removed Fullscreen in option.txt which is currently non-functional
- Unavailable mods: No Chat Reports, No Chat Restrictions
[v4.1.0-alpha.1] 4.1.0-alpha.1 for MC 26.2
by RoonMoonlight on Oct 17, 2026
Download
> **WARNING:** This version has No Chat Report mod disabled, and using this version while connected to server **may be affected with built-in Chat Report feature from Mojang**. Proceed with your own risk.
> **Notice: This is pre-release.** All contents included on pre-release are subject to change, and may contain bugs/glitches.
## What's new
> **Notice: This is pre-release.** All contents included on pre-release are subject to change, and may contain bugs/glitches.
## What's new
- Rebased MC version to 26.2 and updated most of mods to latest release
- Added Fast Noise, a continuation and better alternatives to Noisium which has been discontinued
- Amacs has been removed starting with 26.2 as we determined that the mod only provides more bloats than we expected - Don't worry, we will find some alternatives that does not provide excessive features
- Cleaned up some bugfixes (MC-89146 and MC-263865)
- Cleaned up some unused configuration files and unnecessary keybinds
- Disabled Banner Optimization and experimental stuffs on Better Block Entities
- Unavailable mods: Cubes Without Borders, Debugify, Language Reload, No Chat Reports, No Chat Restrictions
[v4.0.2] 4.0.2 for MC 26.1.2
by RoonMoonlight on Oct 17, 2026
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> **Annoucement:** QuantuMiz Projects now follow the [Sodium's Support Policy](https://github.com/CaffeineMC/sodium/wiki/Support-Policy) with some of our Support Policy mixed. When the Sodium marks specific MC version as 'branched', that branch will be marked as LTS branch and will have support up to 13 months, updated every month. This will apply starting with 26.1 and onwards. More information will be shared later on our wiki page.
## What's new
## What's new
- Updated Fabric Loader to 0.19.3
- Updated C2ME, Config Manager, Controlify, Crash Assistant, Cubes Without Borders, Fabric API, Lithium, YetAnotherConfigLib, featuring major optimization, bug fixes and improvements
- Config Manager: Added Ukrainian and Tartar translations
- Lithium: Reduction of allocations in entity explosion exposure raycasts, Usage of caching in entity explosion exposure block access, and more
- Unnecessary shortcuts has been disabled by default, including some 'Toggle' series from Amacs mod
[v4.0.1] 4.0.1 for MC 26.1.2
by RoonMoonlight on Oct 17, 2026
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A minor update dropped addressing some fixes and mitigations.
## What's new
## What's new
- Updated Cubes Without Border, Dynamic FPS, Fabric API, Lithium
- Cubes Without Borders: Implemented a fallback for players with faulty GPU drivers that automatically puts them into borderless mode if exclusive fullscreen is about to crash their game
- Lithium: Fix client crash when giving an item to an allay
- And few minor fixes and changes included
[v4.0.0] 4.0.0 for MC 26.1.2
by RoonMoonlight on Oct 17, 2026
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Welcome to the major update for QuantuMiz and QuantuMiz CE! This release's codename is 'Rhea', a minor planet No. 577 starting with letter 'R'. This update provides a major overhaul of QuantuMiz CE, including fresh new improvements.
Starting with this update, we have made decision to discontinue the QuantuMiz Fresh and QuantuMiz series below 3.x.x series. Thank you for your support and understanding.
## What's new
Starting with this update, we have made decision to discontinue the QuantuMiz Fresh and QuantuMiz series below 3.x.x series. Thank you for your support and understanding.
## What's new
- Rebased to MC 26.1.2 and updated all mods to support latest release** (Backwards compatible with 26.1 and 26.1.1 without issues)
- Updated Fabric Loader to 0.19.2
- Re-organized the options.txt and added some useful configurations (Thank you Simply Optimized & Up to Date Team for some configuration!)
- Disabled Auto Jump by default
- Narrator is now disabled by default
- Japanese fonts now no longer use glyph variants by default
- Unicode Fonts are disabled by default
- Added FPS Limit when inactive, saving some battery life
- Added Amacs - Now you can bind the combination key for more customization!
- Added No Chat Restrictions - Now flagged Microsoft account can now chat again without issues
- Enhanced Block Entities feature is back online** - as Better Block Entities mod!
- Added Crash Assistant**
- When the game crashes due to bug, a Crash Assistant UI will appear before exiting the client.
- Within Crash Assistant UI, you can find the related crash logs, upload it to sites like mclo.gs easily and report it to our issue tracker.
- Replaced YOSBR with Config Manager** - You now have option to update the configuration or reset the configuration while keeping the modpack defaults
[v4.0.0-beta.3] 4.0.0-beta.3 for MC 26.1.2
by RoonMoonlight on Oct 17, 2026
Download
- As of May 2026, we have migrated the source code from GitHub to Codeberg. Now future source code will be updated on Codeberg instead of GitHub. [Why?](https://sfconservancy.org/GiveUpGitHub)**
> **Notice: This is pre-release.** All contents included on pre-release are subject to change, and may contain bugs/glitches.
## What's new
### QuantuMiz
- Updated BBE, C2ME, Crash Assistant, Fabric API, Sodium, YetAnotherConfigLib
[v4.0.0-beta.2] 4.0.0-beta.2 for MC 26.1.2
by RoonMoonlight on Oct 17, 2026
Download
Possible final beta release, unless the Simple HUD Enhanced and WAIG takes so long before 26.2 update (predicted to be released in Summer 2026).
> **Important Announcement (Please Read):**
>----
> We are currently in progress of migrating the Codeberg due to [various reasons](https://sfconservancy.org/blog/2022/jun/30/give-up-github-launch/).
> Because of that, QuantuMiz Project's source code, issue tracker, releases from GitHub will no longer available at the end of April 2026.
> However, issue tracker will be provided in the [seperate repository](https://github.com/QuantuMiz/issuetracker) for those who still use GitHub, and the archive will still be present on Modrinth for better accessibility.
> Thank you for your understanding.
> **Notice: This is pre-release.** All contents included on pre-release are subject to change, and may contain bugs/glitches.
## What's new
> **Important Announcement (Please Read):**
>----
> We are currently in progress of migrating the Codeberg due to [various reasons](https://sfconservancy.org/blog/2022/jun/30/give-up-github-launch/).
> Because of that, QuantuMiz Project's source code, issue tracker, releases from GitHub will no longer available at the end of April 2026.
> However, issue tracker will be provided in the [seperate repository](https://github.com/QuantuMiz/issuetracker) for those who still use GitHub, and the archive will still be present on Modrinth for better accessibility.
> Thank you for your understanding.
> **Notice: This is pre-release.** All contents included on pre-release are subject to change, and may contain bugs/glitches.
## What's new
- Rebased to MC 26.1.2 (Backwards compatible with 26.1~26.1.1)
- Updated Fabric Loader to 0.19.2
- Updated BadOptimizations, BBE, C2ME, Continuity, Controlify, Crash Assistant, Fabric API, Lithium, Placeholder API, Sodium Extra
- Updated and re-enabled Cubes Without Borders, Debugify, Disable Compliance Notifications
- Re-enabled Cloth Config (Reinstalled due to corrupted jar file preventing the launch)
- Corrected link for the Issue Tracker from GitHub to Codeberg on Crash Assistant
- Corrected wrong version name in Main Menu (Now it should display as 26.1.2 instead of 1.21.11)
[v4.0.0-beta.1] 4.0.0-beta.1 for MC 26.1.1
by RoonMoonlight on Oct 17, 2026
Download
Phew, this took a lot than I expected. Because of that this has big changes included! Sorry for being late, once again.
> **Notice: This is pre-release.** All contents included on pre-release are subject to change, and may contain bugs/glitches.
## What's new
### QuantuMiz
> **Notice: This is pre-release.** All contents included on pre-release are subject to change, and may contain bugs/glitches.
## What's new
### QuantuMiz
- Rebased to 26.1.1 & Updated some of the mods for 26.1.1 release (Backwards compatible with 26.1 without issues)
- Re-organized the options.txt and added some useful configurations (Thank you Simply Optimized & Up to Date Team for some configuration!)
- Disabled Auto Jump by default
- Narrator is now disabled by default
- Japanese fonts now no longer use glyph variants by default
- Unicode Fonts are disabled by default
- Added FPS Limit when inactive, saving some battery life
- Added Amacs - Now you can bind the combination key for more customization!
- Added No Chat Restrictions - Now accounts with Mojang/Microsoft flagged can now chat again without issues
- Added Better Block Entities mod, providing FPS boost when block entity is present
- Replaced YOSBR with Config Manager, and now provides option to update or reset the configuration manually
- Cloth Config API has been disabled due to critical bug (See [this issue](https://github.com/shedaniel/cloth-config/issues/348))
- Mods not updated: Cloth Config API, Cubes Without Borders, Debugify, Disable Compliance Notifications
[v3.5.5] 3.5.5 for MC 1.21.11
by RoonMoonlight on Oct 17, 2026
Download
Possibly a last release of 1.21 series before moving onto 26.1 branch. The next alpha release will arrive within few days.
## What's new
## What's new
- Updated Iris, Mod Menu, Sodium
[v3.5.4] 3.5.4 for MC 1.21.11
by RoonMoonlight on Oct 17, 2026
Download
This update includes various improvements, optimization and fixes.
## What's new
## What's new
- Updated C2ME, Controlify, Iris, Sodium, Lithium, Placeholder API
[v3.5.3] 3.5.3 for MC 1.21.11
by RoonMoonlight on Oct 17, 2026
Download
## What's new
### General
### QuantuMiz: Competitive Edition
### General
- Updated Controlify, Fabric API, Lithium, Placeholder API
- Includes various performance optimizations and fixes
### QuantuMiz: Competitive Edition
- Updated Fabric Language Kotlin, Nametag Tweaks, Zoomify
- Zoomify: Now compatible with Controlify 3.x updates
- Includes various fixes
[v3.5.2] 3.5.2 for MC 1.21.11 (Kaguya Monogatari)
by RoonMoonlight on Oct 17, 2026
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Starting with this release, I might be busy on weekdays (I got a new job) and may not follow schedule anymore (though it will still follow at least 2 weeks schedule). Sorry and thank you for your understanding.
## What's new
### General
### QuantuMiz: Competitive Edition
## What's new
### General
- Re-added Cubes Without Borders
- Updated C2ME, Disable Compliance Notice, Dynamic FPS, Fabric API, FerriteCore, Iris, Reese's Sodium Options, Sodium
- Sodium: Fixed prevention of launch from Wayland desktops
- Iris: Added new normal encoding system
- Reese's Sodium Options: Added Japanese Translation, and category tab button's colored font support
- And additional fixes and improvements, ready to go!
- Removed MoreCulling mod due to frequent incompatibilty issues with other mods
### QuantuMiz: Competitive Edition
- Updated Simple Block Overlay
[v3.5.1] 3.5.1 for MC 1.21.11 (Late Definitive Edition)
by RoonMoonlight on Oct 17, 2026
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Sorry for the late release... I totally forgot to update this modpack as planned due to reminder for some reason, did not work at all.
~~Totally not a forgotten release~~
## What's new
### General
### QuantuMiz: Competitive Edition
### Known issues
~~Totally not a forgotten release~~
## What's new
### General
- Re-added Debugify, Language Reload
- Updated C2ME, Controlify, Dynamic FPS, Fabric API, Mod Menu, More Culling, Sodium Extra, YetAnotherConfigLib
- C2ME now fully supports Minecraft 1.21.11
- And additional fixes and improvements, ready to go.
### QuantuMiz: Competitive Edition
- Updated Dynamic Crosshair, Simple Block Overlay, TipTapShow, Zoomify
- Simple Block Overlay: Now Custom Block Overlay can be disabled in Mod Menu Settings
- Keystrokes (TipTapShow): Added option to keep the Keystrokes UI while in F3 mode
- And additional fixes and improvements, ready to go (again).
### Known issues
- Borderless Windows option will not be available due to Cubes Without Borders mod is currently in rebuilding progress for 1.21.11 update.
[v3.5.0] 3.5.0 for MC 1.21.11
by RoonMoonlight on Oct 17, 2026
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- "Another late holiday, another release."*
Sorry for the late release! I was busy with the final exam and was sorting stuffs, the priority was way too behind.
Thank you to everyone who have been waiting for this release patiently. Hope you enjoy your holiday with this release!
## What's new
### General
- Rebased to Minecraft: Java Edition 1.21.11
- Updated most of the mods to 1.21.11
- QuantuMiz now requires Java 25 to launch
- BadOptimization: Migrated to Mojang Mapping
- ModMenu: Add Feature - Mail-To Contacts
- Lithium: Villager AI optimization fixes
- Sodium: Critical bug related to FRAPI
- And many bug fixes and improvements
- Updated Fabric Loader to 0.18.4
- Removed Model Gap Fix as the related bug is now fixed in [25w44a Update](https://www.minecraft.net/en-us/article/minecraft-snapshot-25w44a)
- Temporarily removed Cubes Without Borders until it's rebuilt for 1.21.11 update ([Why?](https://github.com/Kira-NT/cubes-without-borders/issues/82#issuecomment-3665163687))
- Unavailable mods: Debugify, Language Reload
### QuantuMiz: Competitive Edition
- Updated all related mods to latest release
### Known issues
- Borderless Windows option will not be available due to Cubes Without Borders mod is currently in rebuilding progress for 1.21.11 update.
[3.4.3] 3.4.3 for 1.21.8 (Very Late Spooky Season Update)
by RoonMoonlight on Oct 17, 2026
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- "Happy Halloween! Oh wait, are we late?"*
This is the very late Spooky Season Update, due to developer Roon was unable to work on the modpack due to his magical academy's exam.
He had took a long way to get back into the development, here is late gift for everyone who deserves a spooky jumpscare and chilling experience.
Thank you so much for your patience and support. Hope you enjoy the update, and enjoy the spooky festival!
## What's new
### QuantuMiz
- Updated Controlify, Fabric API, ImmediatelyFast
- Fixed the temporarily disabling of the enhanced steam deck driver causing a Decky popup
- Fixed performance issue when using Iris Shaders
- And various bugs and crash fixes
### QuantuMiz: Competitive Edition
- Updated CraftPresence, Fabric Language Kotlin, UniLib
- Various bugs and crash fixes
[3.4.2] 3.4.2 for 1.21.8
by RoonMoonlight on Oct 17, 2026
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As we previously [announced](https://github.com/QuantuMiz/QuantuMiz/discussions/44) in the past, the main QuantuMiz and QuantuMiz: Competitive Edition will stay on 1.21.8 until next drop, 'Mounts of Mayham'.
If you wish to have faster updates, we recommend using the [QuantuMiz Fresh](https://modrinth.com/modpack/quantumiz-fresh), which is the most up-to-date QuantuMiz with minimal/lightweight features.
## What's new
### QuantuMiz
### QuantuMiz: Competitive Edition
If you wish to have faster updates, we recommend using the [QuantuMiz Fresh](https://modrinth.com/modpack/quantumiz-fresh), which is the most up-to-date QuantuMiz with minimal/lightweight features.
## What's new
### QuantuMiz
- Updated Fabric Loader to 0.17.3
- Added Sodium Extra, which provides more settings on top of Sodium
- Updated BadOptimizations, Controlify, Fabric API, Iris, Lithium, More Culling, No Chat Report, Sodium
- Controlify: Temporarily disabled Enhanced Driver due to crash on Steam Deck
- Sodium: Added support for Fabric's Item Rendering APIs
- Various bugs and crash fixes
### QuantuMiz: Competitive Edition
- Updated Gamma Utils, Plasmo Voice, Simple Block Overlay, UniLib, Zoomify
- Block Overlay now supports Iris Shaders
- Improved Performance for Gamma feature
- Various bugs and crash fixes
