{"id":36265,"date":"2026-06-01T20:57:20","date_gmt":"2026-06-01T17:57:20","guid":{"rendered":"https:\/\/vpesports.com\/minecraft\/mods\/c2me-fabric\/"},"modified":"2026-06-01T20:57:20","modified_gmt":"2026-06-01T17:57:20","slug":"c2me-fabric","status":"publish","type":"mod","link":"https:\/\/vpesports.com\/minecraft\/mods\/c2me-fabric\/","title":{"rendered":"Concurrent Chunk Management Engine (Fabric)"},"content":{"rendered":"

# Concurrent Chunk Management Engine (Fabric)<\/p>\n

A Fabric mod designed to improve the chunk performance of Minecraft.<\/p>\n

Looking for NeoForge versions?<\/p>\n

## Benchmarks for 1.21.10 w\/ Terralith (Nov 21, 2025)
\n|2t-80t|1t-16t|
\n|——|——|
\n|![](https:\/\/cdn.modrinth.com\/data\/VSNURh3q\/images\/70c889a64380a7a910d9f66a2ebfa3ac31091a3c.png)|![](https:\/\/cdn.modrinth.com\/data\/VSNURh3q\/images\/617e22ef488a67375c04738554e38738e8300025.png)|<\/p>\n

## So what is C2ME?
\nC^2M-Engine, or C2ME for short, is a Fabric mod designed to improve the performance of chunk generation, I\/O, and loading. This is done by taking advantage of multiple CPU cores in parallel. For the best performance it is recommended to use C2ME with Lithium and ScalableLux.<\/p>\n

## What does C2ME stand for?
\nConcurrent chunk management engine, it’s about making the game better threaded and more scalable in regard to world gen and chunk io performance.<\/p>\n

## Vanilla parity
\nC2ME does not sacrifice vanilla functionality or behavior, or alter the vanilla world generation in the name of raw speed by default.
\nHowever, due to the non-determinism of vanilla world generation, worlds will vary
\nsignificantly run-to-run even with the same seed. This is not a bug on our side. <\/p>\n

While we carefully check that we do not modify any vanilla behavior, bugs are unavoidable after all.
\nSo, if you do encounter an issue where C2ME deviates from the intended vanilla behavior, don’t hesitate to open an issue.<\/p>\n

## Mod and Datapack compatibility
\nWorld generation datapacks that can run on vanilla Minecraft are fully supported.
\nCustom world generators implemented in mods usually runs well, but *may* cause compatibility issues due to certain
\ndesign assumption used by mod authors being broken for further speedups of world generation.
\nAs a world generation mod author, if you find your mod broken, don’t hesitate to look for help in our discord server (linked below).
\nWe are willing to help mod authors to embrace scalable world generation. <\/p>\n

### Undefined behavior sanitization
\nC2ME includes `CheckedThreadLocalRandom` for world random (included in UWRAD) plus a few others.
\nThese detections exist to prevent mods from screwing up Minecraft internals and causing undebuggable problems.
\nThe detection should almost **never** produce false positives, and should be taken seriously and reported
\nto corresponding mod authors instead.<\/p>\n

## Usage notice
\n**Backup your worlds and practice good game modding skills.**<\/p>\n

## Support status for Minecraft versions
\nOnly the latest Minecraft release and the latest Minecraft snapshot are fully supported.
\nOlder Minecraft releases are in long-term support and will receive critical bug fixes.
\nOlder Minecraft snapshots are not supported. <\/p>\n

## Support
\nOur issue tracker: link
\nOur discord server: link<\/p>\n

## More information
\nCheck out the `README.md` here: https:\/\/github.com\/RelativityMC\/C2ME-fabric<\/p>\n

## Previous benchmarks<\/p>\n

\nBenchmarks for 1.21.3 (Nov 24, 2024)<\/summary>\n

|2t-80t|1t-10t|
\n|——|——|
\n|![](https:\/\/cdn.modrinth.com\/data\/VSNURh3q\/images\/42800de67ef67d429f43d3e5d8df40a086f5b2c8.png)|![](https:\/\/cdn.modrinth.com\/data\/VSNURh3q\/images\/1f420f0e635681502993cb3abb46018e2e8d83dd.png)|<\/p>\n

Footnotes: https:\/\/gist.github.com\/ishland\/9601a033afad4be5b17ffaed859577fd<\/p>\n<\/details>\n

## Footnotes<\/p>\n

\nFootnotes for benchmarks<\/summary>\n

## Benchmark setup
\nAll benchmark done with dual-socket `Intel(R) Xeon(R) Gold 5218R` limited to 2GHz max, on Debian 13.
\n“`
\nopenjdk version “25.0.1” 2025-10-21 LTS
\nOpenJDK Runtime Environment Zulu25.30+17-CA (build 25.0.1+8-LTS)
\nOpenJDK 64-Bit Server VM Zulu25.30+17-CA (build 25.0.1+8-LTS, mixed mode)
\n“`<\/p>\n

Datapack used: `Terralith_1.21.5_v2.5.13.zip`
\nhttps:\/\/modrinth.com\/datapack\/terralith\/version\/RFNry3l0 <\/p>\n

### C2ME benchmark
\nFabric mods used for C2ME benchmark:
\n“`
\nc2me-fabric-mc1.21.10-0.3.5.1.0.jar
\nChunky-Fabric-1.4.51.jar
\nfabric-api-0.138.3+1.21.10.jar
\nlithium-fabric-0.20.1+mc1.21.10.jar
\nScalableLux-0.1.6+fabric.c25518a-all.jar
\nspark-1.10.152-fabric.jar
\nvmp-fabric-mc1.21.10-0.2.0+beta.7.217-all.jar
\n“`
\nChanged settings (`c2me.toml`):
\n– `globalExecutorParallelism` set to thread count<\/p>\n

### Paper benchmark
\nPaper used: `paper-1.21.10-113.jar`
\nPaper plugin used: `Chunky-Bukkit-1.4.40.jar`
\nChanged settings (`paper-global.yml`):
\n– `worker-pool.io-threads = 4`
\n– `worker-pool.worker-threads` set to thread count<\/p>\n

### Vanilla benchmark
\nFabric mods used for vanilla benchmark:
\n“`
\nChunky-Fabric-1.4.51.jar
\nfabric-api-0.138.3+1.21.10.jar
\nspark-1.10.152-fabric.jar
\n“`
\nExtra JVM flags: `-Dmax.bg.threads=` set to thread count<\/p>\n

All benchmarks are run on tmpfs, on overworld, with world folder emptied before each JVM execution.
\nSeed: `114862964781274189`
\n`force-load-existing-chunks` is turned on in Chunky config. <\/p>\n

## 2-80 threads benchmark
\nJVM flags: `-Xmx32G -Xms32G -Xss4m -Xshare:off -XX:+DisableExplicitGC -XX:+UseNUMA -XX:+UseZGC -XX:-ZUncommit -XX:+UseLargePages -XX:+UseTransparentHugePages -XX:+UnlockExperimentalVMOptions -XX:-OmitStackTraceInFastThrow -XX:+AlwaysPreTouch -XX:+UnlockDiagnosticVMOptions -XX:+DebugNonSafepoints -Dchunky.maxWorkingCount=256`
\nFor vanilla tests only: `-Xmx64G -Xms64G` is used to avoid crashes during benchmark
\nWarmup phase: 2048 block radius with `0 0` as center (data discarded)
\nMeasurement phase: 4096 block radius with `1000000 1000000` as center (263169 chunks in total)<\/p>\n

| Thread count | C2ME cps | Paper cps | Vanilla cps |
\n|————–|———-|———–|————-|
\n| 2 | 22.62 | 17.37 | 10.63 |
\n| 4 | 45.02 | 34.17 | 12.67 |
\n| 6 | 69.42 | 50.87 | 13.64 |
\n| 8 | 89.94 | 63.14 | 13.26 |
\n| 10 | 115.53 | 72.66 | 14.25 |
\n| 12 | 135.93 | 78.63 | 14.58 |
\n| 14 | 159.01 | 82.09 | 14.57 |
\n| 16 | 182.38 | 84.76 | 14.22 |
\n| 18 | 208.45 | 88.94 | |
\n| 20 | 230.04 | 89.91 | |
\n| 22 | 252.08 | 87.66 | |
\n| 24 | 274.85 | 88.82 | |
\n| 26 | 297.70 | 88.43 | |
\n| 28 | 317.26 | 86.31 | |
\n| 30 | 334.40 | 87.69 | |
\n| 32 | 358.87 | 85.06 | |
\n| 34 | 377.21 | 87.52 | |
\n| 36 | 392.01 | 87.40 | |
\n| 38 | 407.59 | 85.14 | |
\n| 40 | 415.31 | 84.62 | |
\n| 42 | 423.33 | 86.06 | |
\n| 44 | 425.38 | 85.56 | |
\n| 46 | 424.47 | 86.28 | |
\n| 48 | 438.13 | 85.03 | |
\n| 50 | 440.57 | 85.31 | |
\n| 52 | 441.81 | 86.43 | |
\n| 54 | 444.29 | 83.81 | |
\n| 56 | 446.81 | 84.13 | |
\n| 58 | 444.29 | 85.03 | |
\n| 60 | 449.86 | 83.81 | |
\n| 62 | 453.48 | 85.50 | |
\n| 64 | 451.40 | 84.89 | |
\n| 66 | 454.26 | 83.60 | |
\n| 68 | 454.26 | 84.21 | |
\n| 70 | 457.16 | 83.89 | |
\n| 72 | 456.36 | 83.47 | |
\n| 74 | 460.09 | 84.70 | |
\n| 76 | 455.05 | 83.31 | |
\n| 78 | 459.82 | 83.39 | |
\n| 80 | 460.35 | 81.43 | 14.58 |<\/p>\n

## 1-16 threads benchmark
\nJVM flags: `-Xmx16G -Xms16G -Xss4m -Xshare:off -XX:+DisableExplicitGC -XX:+UseNUMA -XX:+UseZGC -XX:-ZUncommit -XX:+UseLargePages -XX:+UseTransparentHugePages -XX:+UnlockExperimentalVMOptions -XX:-OmitStackTraceInFastThrow -XX:+AlwaysPreTouch -XX:+UnlockDiagnosticVMOptions -XX:+DebugNonSafepoints -Dchunky.maxWorkingCount=256`
\nWarmup phase: 1024 block radius with `0 0` as center (data discarded)
\nMeasurement phase: 2048 block radius with `1000000 1000000` as center (66049 chunks in total) <\/p>\n

| Thread count | C2ME cps | Paper cps | Vanilla cps |
\n|————–|———-|———–|————-|
\n| 1 | 11.62 | 8.05 | 7.37 |
\n| 2 | 22.65 | 16.19 | 10.01 |
\n| 3 | 33.46 | 24.45 | 11.46 |
\n| 4 | 44.95 | 32.52 | 12.05 |
\n| 5 | 56.94 | 40.65 | 12.41 |
\n| 6 | 68.55 | 48.32 | 12.61 |
\n| 7 | 79.82 | 54.95 | 12.83 |
\n| 8 | 91.57 | 60.15 | 12.83 |
\n| 9 | 104.76 | 63.88 | 13.08 |
\n| 10 | 114.42 | 68.66 | 13.53 |
\n| 11 | 126.83 | 70.72 | 13.01 |
\n| 12 | 138.73 | 72.34 | 13.39 |
\n| 13 | 148.35 | 75.57 | 13.58 |
\n| 14 | 162.25 | 76.01 | 13.34 |
\n| 15 | 172.34 | 76.27 | 13.56 |
\n| 16 | 183.78 | 77.43 | 13.72 |<\/p>\n<\/details>\n","protected":false},"excerpt":{"rendered":"

A Fabric mod designed to improve the chunk performance of 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