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Eslium Backport

By sz_coOwner

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[Updated] Predicts server actions : general latency/ping effects optimizer now available on 1.16 and 1.21

Performance & Optimization

Mod Loaders

Fabric

Minecraft

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Get it on

Available Platforms

Modrinth

Compatibility

Supported Environments

Where It Runs

Client Only

Runs entirely on the client. Works on vanilla servers.

About

Project Details

Type

Mod

License

GNU Lesser General Public License v3.0 only

Latest Version

4.6.0

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Identifiers

Platform IDs

Modrinth ID

Resources

External Links

Source Issues Wiki Discord

About

Description

Eslium Backport

What's Eslium ?

Eslium is a project to predict more things client-side. For example, if you want to use a Crystal, you must wait for the server validation for it to appear. This mod fixes that and therefore compensates for the ping.

Credits

Original mod: Eslium on Modrinth by @Solmeye
Backport: @1szco1

Predictions implemented

Minecarts

When using any type of minecart on a rail, the spawn of the minecart is predicted

End Crystal

When using an end crystal on obisidian or bedrock, the spawn of the end crystal is predicted

Predictions Added so far:

Consumables
Cooldowns
Crystals
Elytras
Firework
Minecart
Pose
Swap
Weapons
Windcharge
Throwables
Placeables
Interactables
Tools
Combat
Redstone
Anchors
Placement

Configuration

The mod can be configured in-game through Mod Menu (optional dependency) or with the rebindable keybind key.clienthings.open_config (unbound by default - set it in Options → Controls). The configuration is stored at config/eslium.json.

Every prediction section shares the same base options:

enabled - toggle this prediction
servers - which server types it applies to (applies if any is enabled):
- CUSTOM - servers using the Eslium protocol
- MODDED - modded servers
- PLUGIN - plugin-based servers
- VANILLA - vanilla servers
- maxTime - maximum time in ms to keep a predicted (not yet confirmed) action alive
- maxDistance - maximum distance in blocks for the prediction (where applicable)

Default configuration

{
  "enabled": true,
  "optout": false,
  "debug": false,
  "experimental": false,
  "latencyMargin": 25,
  "version": 1,
  "safeMode": false,
  "simulatedDesync": 100,
  "consumables": { "enabled": false, "servers": { "CUSTOM": true, "MODDED": true, "PLUGIN": true, "VANILLA": true }, "maxTime": 5000, "maxDistance": 16 },
  "cooldowns": { "enabled": false, "servers": { "CUSTOM": true, "MODDED": true, "PLUGIN": true, "VANILLA": true } },
  "crystals": {
    "enabled": true,
    "servers": { "CUSTOM": true, "MODDED": true, "PLUGIN": true, "VANILLA": true },
    "maxTime": 5000,
    "delay": 0,
    "dynamicDelay": true,
    "resync": 20,
    "autoDestroy": { "enabled": true, "maxTime": 5000 }
  },
  "elytras": { "enabled": false, "servers": { "CUSTOM": true, "MODDED": true, "PLUGIN": true, "VANILLA": true }, "maxTime": 5000, "maxDistance": 16 },
  "firework": { "enabled": false, "servers": { "CUSTOM": true, "MODDED": true, "PLUGIN": true, "VANILLA": true }, "maxTime": 5000, "maxDistance": 16 },
  "minecart": { "enabled": true, "servers": { "CUSTOM": true, "MODDED": true, "PLUGIN": true, "VANILLA": true }, "maxTime": 5000 },
  "pose": { "enabled": false, "servers": { "CUSTOM": true, "MODDED": true, "PLUGIN": true, "VANILLA": true } },
  "swap": { "enabled": false, "servers": { "CUSTOM": true, "MODDED": true, "PLUGIN": true, "VANILLA": true } },
  "weapons": { "enabled": false, "servers": { "CUSTOM": true, "MODDED": true, "PLUGIN": true, "VANILLA": true }, "maxTime": 5000, "maxDistance": 16 },
  "windcharge": { "enabled": false, "servers": { "CUSTOM": true, "MODDED": true, "PLUGIN": true, "VANILLA": true }, "maxTime": 5000, "maxDistance": 16 },
  "throwables": { "enabled": false, "servers": { "CUSTOM": true, "MODDED": true, "PLUGIN": true, "VANILLA": true }, "maxTime": 5000, "maxDistance": 16 },
  "placeables": { "enabled": false, "servers": { "CUSTOM": true, "MODDED": true, "PLUGIN": true, "VANILLA": true }, "maxTime": 5000, "maxDistance": 16 },
  "interactables": { "enabled": false, "servers": { "CUSTOM": true, "MODDED": true, "PLUGIN": true, "VANILLA": true }, "maxTime": 5000, "maxDistance": 16 },
  "tools": { "enabled": false, "servers": { "CUSTOM": true, "MODDED": true, "PLUGIN": true, "VANILLA": true }, "maxTime": 5000, "maxDistance": 16 },
  "combat": { "enabled": false, "servers": { "CUSTOM": true, "MODDED": true, "PLUGIN": true, "VANILLA": true }, "maxTime": 5000, "maxDistance": 16 },
  "redstone": { "enabled": false, "servers": { "CUSTOM": true, "MODDED": true, "PLUGIN": true, "VANILLA": true }, "maxTime": 5000, "maxDistance": 16 },
  "anchors": {
    "enabled": true,
    "servers": { "CUSTOM": true, "MODDED": true, "PLUGIN": true, "VANILLA": true },
    "maxTime": 3000,
    "glowstoneSound": true,
    "clientExplosion": true,
    "reInteract": true,
    "ghostAnchor": true
  },
  "placement": {
    "enabled": true,
    "servers": { "CUSTOM": true, "MODDED": true, "PLUGIN": true, "VANILLA": true },
    "dynamic": true,
    "fixedWindowMs": 1000,
    "floorMs": 50,
    "capMs": 300
  }
}

Explanation

Global options

enabled - enable or disable the whole mod
optout - opts this client out of the Eslium protocol
debug - print debug information to the log (only active while enabled is true)
experimental - allow experimental predictions
latencyMargin - ping in ms added to your estimated latency. Useful to avoid considering actions the server denies after a latency spike. Should represent the current latency fluctuation of your connection.
version - configuration version. Do not touch!
safeMode - reduces the likelihood of being flagged by an impossible anticheat. The probability is already low when disabled. Warning: this can lead to bizarre behavior.
simulatedDesync - percentage (0-100) of the maximum client-server tick desynchronization time used to simulate vanilla desynchronization, which keeps the prediction statistically fair. In singleplayer this is effectively 0, and against a local server it averages around 50. Default 100.

Sections

All sections below share enabled, servers, and (where shown) maxTime / maxDistance: consumables, cooldowns, crystals, elytras, firework, minecart, pose, swap, weapons, windcharge, throwables, placeables, interactables, tools, combat, redstone, anchors, placement.

crystals
- delay - fixed delay in ms before a hit crystal is hidden when dynamicDelay is off (0-200)
- dynamicDelay - when enabled, the delay is estimated automatically from your latency instead of using delay
- resync - number of ticks to hide/resync a real crystal before it is shown again (0-50)
- autoDestroy - automatically remove the client-side crystal prediction after a delay
  - enabled / maxTime
- anchors
  - glowstoneSound - play the charge sound client-side
  - clientExplosion - show the detonation explosion client-side
  - reInteract - allow re-interacting with the anchor before the server confirms
  - ghostAnchor - hide a stale (ghost) anchor block
- placement - fixes block-placement "ghosting" (a placed block briefly reverting to its old state)
  - dynamic - derive the settle window automatically from your measured latency
  - fixedWindowMs - window used when dynamic is false
  - floorMs / capMs - lower/upper bounds for the dynamic window

Disclaimer

Allowed on servers such as:

PvPClub
FadedMC
Turtled
CatPvP

Versions 4.0+ are designed not to trigger anticheats. However, a bug is not inevitable, so it is still recommended to request authorization for this mod before using it on a server.

FAQ

How it works ?

This mod uses mixins to inject code into Minecraft code. During certain actions, if implemented, the behavior of a vanilla server is replicated on the client side.

Is this mod a cheat?

You might think this mod is a cheat because it gives an advantage to those who don't have it, and these kinds of mods often raise these kinds of questions.

Here are a few points :

Some people naturally have lower ping, yet it is not considered cheating
It is possible to have 0ms ping behavior in vanilla, but it is also possible to have it (as far as it is implemented) with any ping and Eslium.
Some mods remain accepted by the community but their behavior is impossible to reproduce in vanilla. I'm thinking in particular of Health Indicator, Armor HUD, AppleSkin, FreeCam, and Ok Zoomer.
This mod has been accepted by Modrinth and some PvP servers.
Sodium optimize FPS, Lithium optimize MSPT, Eslium optimize the ping's impact.
Other ping's optimizer are allowed, such as Marlow's Crystal Optimizer, Hero's Elytra Optimizer, Consumable Optimizer or Anchor Optimizer

Will versions 4.0+ be backported for minecraft 1.16.5?

Yes, it already have.

Compatibility

Eslium should work on any client.

Versions

Files

On ModDex

Community snapshot

Ratings

Followers

In stacks

By the numbers

Statistics

Modpacks using this mod

<1,000

Downloads

Oct 13, 2026

Last Updated

CurseForge

Oct 13, 2026

Modrinth

Oct 13, 2026

Aug 9, 2026

Created

6 days 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

Modrinth

On ModDex

Community snapshot

Ratings

Followers

In stacks

By the numbers

Statistics

Modpacks using this mod

<1,000

Downloads

Oct 13, 2026

Last Updated

CurseForge

Oct 13, 2026

Modrinth

Oct 13, 2026

Aug 9, 2026

Created

6 days ago

Last synced

New file updates sync automatically

How syncing works

Resources

External Links

Source Issues Wiki Discord

Eslium Backport

Reviews

Available Platforms

Supported Environments

Project Details

Embed Badge

Platform IDs

External Links

Description

Eslium Backport

What's Eslium ?

Credits

Predictions implemented

Predictions Added so far:

Configuration

Disclaimer

FAQ

How it works ?

Is this mod a cheat?

Will versions 4.0+ be backported for minecraft 1.16.5?

Compatibility

Gallery

Files

Project Relations

Similar Mods

Community snapshot

Statistics

Available Platforms

Community snapshot

Statistics

External Links