Concurrent Chunk Management Engine (Fabric)
ModA mod designed to improve the chunk performance of Minecraft.
- Security
- Passed
- Privacy
- None found
- Runs on
- Server, client optional
- Loaders
- Fabric, NeoForge
- Minecraft versions
- Up to 26.3
Why gradeA
How grades workStrengths
Points lost
- Many modpacks removed it−4 points
All 11 criteria
Maintenance
Full points27 / 27Last releaseHow long ago the newest file came out, or an existing file was marked as working on a new Minecraft version.5 days ago (20 Oct 2026) 12 / 12Supports popular versionsWhether the project has a file for a Minecraft version that 15% or more of the popular mods updated in the last 6 months also support. A version many modpacks use, like 1.20.1 or 1.21.1, also counts after a release in the last 12 months.26.3 on Fabric and NeoForge (latest) 9 / 9Regular releasesIn how many of the last 24 months a new file came out. Full points at 8 months.Releases every month for 2 years 6 / 6Stability
4 points lost18 / 22Removed from modpacksHow many modpacks removed it in a later version of the pack. We can only see this in modpacks with two or more versions. A pack that swaps it for another edition of the same project, or that is rebuilt from scratch, does not count.78 of the 351 modpacks with two or more versions removed it in a later one (22%) See the 78 modpacks6 / 10Quick fixesHow often a release needed a quick fix: a new release within 3 days to fix a problem in it.Not counted: it puts out releases very often, so quick fixes are normal for it 7 / 7Known conflictsHow many projects say they do not work with it, compared with how widely it is used. Packs, small projects, forks, ports, add-ons, alternatives and old versions do not count.3 of 15 known conflicts count in the grade See the 15 known conflicts5 / 5Transparency
Full points10 / 10Source codeWhether the project page links to its source code, so anyone can read what it does.GitHub · RelativityMC/C2ME-fabric 7 / 7Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.GitHub issues · ishlandbukkit/C2ME-fabric 3 / 3Popularity
Full points4 / 4DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.63,023,858 4 / 4Track record
Full points8 / 8AgeHow long the project has existed. It counts less when no new file came out recently.5.1 years, 830 releases 8 / 8Security
PassedFile checksThis check adds no points. It can only take points away.Our checks found nothing harmful in all 24 latest files for recent Minecraft versions. See Security
66.9 of the 71 points that apply = 94 out of 100. The points above are rounded to whole numbers.
Images
About
Concurrent Chunk Management Engine (C2ME) improves Minecraft chunk generation, loading, and input/output performance by distributing work across multiple CPU cores, making chunk processing more parallel and scalable. It aims to preserve vanilla behavior and world generation by default, and supports vanilla-compatible world-generation datapacks; modded world generators generally work but may encounter compatibility issues. C2ME also includes checks such as CheckedThreadLocalRandom to detect potentially unsafe mod behavior that could interfere with Minecraft internals.
Written from Modrinth , CurseForge and the GitHub README . How we write it
In-game changes
Changes the game's code in 13 areas: World generationChanges 68 game code files in this area: terrain, biomes and structures made when new land is created., Chunk loading and storageChanges 20 game code files in this area: how the game loads, tracks, saves and unloads chunks., Server and world logicChanges 12 game code files in this area: the world, commands, scoreboards, saved data and game rules., Game coreChanges 8 game code files in this area: the main loop, lighting and other code the whole game uses., Networking and multiplayerChanges 4 game code files in this area: connections, the server list and what is sent between your game and a server., Mobs and their behaviorChanges 3 game code files in this area: mobs, animals, villagers, projectiles and how they move and act., Blocks and fluidsChanges 3 game code files in this area: how blocks, fluids and redstone work., PlayerChanges 3 game code files in this area: your character: movement, abilities, hunger and controls., Rendering and graphicsChanges 2 game code files in this area: drawing mobs, items, particles and textures on screen., Game optionsChanges 1 game code file in this area: settings, key bindings and the option screens., User interfaceChanges 1 game code file in this area: menus, screens, tooltips, the chat window and the in-game overlay., Game data and resourcesChanges 1 game code file in this area: recipes, tags, advancements, language files and other game data. and World renderingChanges 1 game code file in this area: drawing the terrain, sky, clouds and weather..
Adds no new blocks, items or other content.
Keeps all of vanilla Minecraft's textures, models and sounds.
Details
- Creators
- ishland and duplexsystem
- License
- MIT License
- Downloads
- 63M
- Created
- 2 Oct 2021
- Official pages
- Modrinth , CurseForge
- Links
- Source code , Issues , Discord
Security
No harmful code found
We checked its files and read their code, without running it.
What it can do on your computer
- Connects to the internet
- It has code that can go online, for example to check for updates, load skins or send crash reports. Found in 3 libraries it includes. See Privacy
- Creates settings files
- The mod keeps its settings in the config folder of your game, where you can change or delete them. 1 file in your config folder.
Why we show this: a mod runs on your computer like any program, so harmful code in it can take your accounts or files. Our checks look for known signs of harm. They cannot prove that a file is harmless. In the grade: malware means no grade, and a Warning in a latest file for a recent Minecraft version lowers it.
How we checked
- FilesWe download the files from Modrinth or CurseForge and look at what is inside them and what their code can do, without running them. Fixed rules tell what is harmful.41 latest files: the newest file for each Minecraft version and loader. The answer above is about the 24 for recent versions. Recent versions: those released in the last 2 years, plus 1.20.1 and 1.21.1, among the most played in modpacks. See each file in Releases
- Their codeWe turn the code of the files back into readable code and follow what it does, without running it. This shows what it downloads, what it sends and where your login goes.Read without running it
- Author on ModrinthThe disclosure form on Modrinth, where the author declares that the project reads or edits things on your system outside the game. Since 13 Aug 2026, Modrinth's rules require it when this applies.Nothing declared about your system outside the game.
- Looked for, not foundWe looked for these in the file and did not find them.Folders outside the game, other programs, updating itself, the webcam or microphone, an AI service.
Privacy
We found nothing it sends
We read its code without running it: it contacts no web address while you play.
Why we show this: a mod can send things about you over the internet, like your player name or your login. Contacting an address to check for updates or download files sends nothing about you. Not in the grade: sending data can be normal for what a mod does.
How we checked
- Files readWe read the code without running it. We list each web address the code contacts while you play, and what it sends. Code that is never used is left out.The code of all 24 files, for recent Minecraft versions. See each file in Releases
- Author on ModrinthThe disclosure form on Modrinth, where the author declares crash reports, usage data and advertisements. Since 13 Aug 2026, Modrinth's rules require it when a project collects data on its users or shows advertisements.Nothing declared about crash reports, usage data or advertisements.
AI
No sign that AI was used to make it
We looked for AI tools in its texts, files, images and code history and found none.
No sign of AI in the game
We found no AI service, AI library or AI model file in its code.
Why we show this: some players and servers avoid projects made with AI, and AI in the game can send what you write to an online service. Not in the grade: using AI does not tell whether a project works well or is kept up to date.
How we checked
- Author on ModrinthThe disclosure form on Modrinth. Since 13 Aug 2026, Modrinth's rules require it when a substantial part of the code is AI output, when an asset is mainly AI output, or when the project or its page relies on generative AI.No AI content or AI features declared.
- Code historyThe public code on GitHub: who made each change, credit lines such as "Co-authored-by", and its files.Nothing found
- Description and changelogsThe description, project page and newest changelogs: sentences saying an AI tool was used, and text pasted from an AI chat.Nothing found25 of 40 changelogs read
- Its filesFiles that AI coding tools leave behind (like AGENTS.md), and the texts inside the files you download.Nothing found
- Images in its filesHidden data in the images of the files you download, where AI image tools write their name and settings.Nothing found1 image read
- Code of the modThe code and files of the mod, read without running it: addresses of AI services, AI libraries, AI model files and a place for your own AI key.No AI service, AI library or AI model file445 code files read
Compatibility
See all 830 filesPoint at or tap a version to see its loaders.
Known conflicts
These projects do not work together with Concurrent Chunk Management Engine (Fabric): their authors or the author of Concurrent Chunk Management Engine (Fabric) say so. If you install both, the game can crash or some features can stop working. Some of them do the same job as Concurrent Chunk Management Engine (Fabric), so you only need one.
Better chunk loadingMod30.5M downloadsdeclared by Concurrent Chunk Management Engine (Fabric)
Dynamic View and Simulation DistancesMod27.7M downloadsdeclared by Concurrent Chunk Management Engine (Fabric)
OptiFabricMod10.1M downloadsdeclared by Concurrent Chunk Management Engine (Fabric)
Cobblemon: Extra StructuresMod2.9M downloadsdeclared by Cobblemon: Extra Structures
Soup Visual (PvP Visual)Mod1.2M downloadsdeclared by Soup Visual (PvP Visual)
MoonriseMod614K downloadsdeclared by Moonrise
Dynamic View[Fabric]Mod458K downloadsdeclared by Concurrent Chunk Management Engine (Fabric)
Legacy OptiFabricMod32K downloadsdeclared by Concurrent Chunk Management Engine (Fabric)
OptiLegacyMod25K downloadsdeclared by Concurrent Chunk Management Engine (Fabric)
AchieveToDoMod20K downloadsdeclared by AchieveToDoRelated projects
Projects that need Concurrent Chunk Management Engine (Fabric) to work.
Modpacks using this project
Find modpacks with it| Oct 2024 | 434 |
|---|---|
| Nov 2024 | 402 |
| Dec 2024 | 436 |
| Jan 2025 | 490 |
| Feb 2025 | 426 |
| Mar 2025 | 551 |
| Apr 2025 | 575 |
| May 2025 | 595 |
| Jun 2025 | 555 |
| Jul 2025 | 613 |
| Aug 2025 | 620 |
| Sep 2025 | 571 |
| Oct 2025 | 714 |
| Nov 2025 | 752 |
| Dec 2025 | 840 |
| Jan 2026 | 905 |
| Feb 2026 | 855 |
| Mar 2026 | 882 |
| Apr 2026 | 916 |
| May 2026 | 1,047 |
| Jun 2026 | 1,068 |
| Jul 2026 | 1,143 |
| Aug 2026 | 1,082 |
| Sep 2026 | 1,057 |
More modpacks put it in their new versions than a year ago: 1,052 a month now, 588 a year agoThe average of the last 6 months, compared with the same 6 months a year before. We say it only when the change is large..
9,787 modpacks include Concurrent Chunk Management Engine (Fabric) in at least one of their versions. Here are the 30 most downloaded.
COBBLEVERSE - Pokemon Adventure [Cobblemon]12.6M downloadslast version with it 22 Jul 2026
Better MC [FABRIC] - BMC25.9M downloadslast version with it 1 Dec 2023
Immersed With Shaders4.5M downloadslast version with it 19 Oct 2026
Homestead3.6M downloadslast version with it 23 Oct 2026
Better MC [NEOFORGE] BMC53.4M downloadslast version with it 8 Sep 2026
Craftoria3M downloadslast version with it 13 Sep 2026
Vanilla Perfected3M downloadslast version with it 13 Oct 2024
Better Adventures+2.2M downloadslast version with it 24 Oct 2026
SkyBlock Enhanced2.1M downloadslast version with it 22 Mar 2026
Dungeon Heroes (RPG Series)2M downloadslast version with it 15 Mar 2026Often in the same modpacks
Mods that modpacks often add together with Concurrent Chunk Management Engine (Fabric). Share: how many of the modpacks with Concurrent Chunk Management Engine (Fabric) also have that mod.
LithiumAModin 88% of the modpacks with Concurrent Chunk Management Engine (Fabric)
FerriteCoreAModin 73% of the modpacks with Concurrent Chunk Management Engine (Fabric)
Mod MenuAModin 70% of the modpacks with Concurrent Chunk Management Engine (Fabric)
Sodium ExtraAModin 66% of the modpacks with Concurrent Chunk Management Engine (Fabric)
Reese's Sodium OptionsAModin 65% of the modpacks with Concurrent Chunk Management Engine (Fabric)
Dynamic FPSAModin 60% of the modpacks with Concurrent Chunk Management Engine (Fabric)
BadOptimizationsAModin 56% of the modpacks with Concurrent Chunk Management Engine (Fabric)
LambDynamicLights - Dynamic LightsAModin 46% of the modpacks with Concurrent Chunk Management Engine (Fabric)
KryptonAModin 45% of the modpacks with Concurrent Chunk Management Engine (Fabric)
Chat HeadsAModin 45% of the modpacks with Concurrent Chunk Management Engine (Fabric)Latest files
The newest file for each Minecraft version and loader. The files for recent versions come first. Recent versions: those released in the last 2 years, plus 1.20.1 and 1.21.1, among the most played in modpacks.