
Modrinth · Minecraft mod
Eslium Backport
[Updated] Predicts server actions : general latency/ping effects optimizer now available on 1.16 and 1.21
Quick answer
Which Eslium Backport release should I use?
Eslium Backport 4.6.0 targets 1.21.11 with Fabric. It must be installed on the client. Do not install it on the dedicated server. No extra mods listed for this file.
Where it goes
Is Eslium Backport required on the client, server, or both?
It must be installed on the client. Do not install it on the dedicated server.
This file is marked client-only.
What else does Eslium Backport 4.6.0 need?
4.6.0. Change the file and its required mods may change too.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add Eslium Backport without breaking your instance.
Built for Eslium Backport 4.6.0. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use 4.6.0. It targets 1.21.11 with Fabric; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
It must be installed on the client. Do not install it on the dedicated server.
- 04
Pick the file you checked
Use the “Get this file” button beside 4.6.0. It opens that exact file at the source.
About this project
What does Eslium Backport add?
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
- 1.21.11 port: @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* :
- Cooldowns
- Consumables
- Elytra
- Firework rocket
- Swap
- Inventory
- Entity pose
- Jukebox
- Crossbow
- Pickup entities
- Trident
- Weapons
- Jukebox
- Bottle o' Enchanting
- Experience
- Ender Pearls
- Potions
- Pick Block
- Cactus damage
- Bed
- Fishing Rod
- Lead
- Boat
- Snowball
- Spawn Eggs
- Egg
- Armor Stand
- Note block
- Item frame
- Dyes
- Interfaces
- Void damage
- Game mode change
- Potion Effects
- Tchat
- Sounds
- Crafting
- Scaffolding
- Knockback
- Fall damage
- Interaction with blocks
- Interaction with entities
- Interaction with items
Configuration
The mod can be configured in-game through Mod Menu (optional dependency) or with the rebindable keybind key.eslium.open_config (unbound by default - set it in Options → Controls). The configuration is stored at config/eslium.json.
The in-game menu lists every prediction. Each entry has an on/off toggle on its right, and clicking the entry itself opens a sub-menu with the dedicated settings for that option (server types, timings, distances, and so on), so everything can be changed on click without editing the file.
Every prediction section shares the same base options:
enabled- toggle this predictionservers- which server types it applies to (applies if any is enabled):CUSTOM- servers using the Eslium protocolMODDED- modded serversPLUGIN- plugin-based serversVANILLA- vanilla servers
maxTime- maximum time in ms to keep a predicted (not yet confirmed) action alivemaxDistance- 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 modoptout- opts this client out of the Eslium protocoldebug- print debug information to the log (only active whileenabledis true)experimental- allow experimental predictionslatencyMargin- 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 effectively0, and against a local server it averages around50. Default100.
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.
crystalsdelay- fixed delay in ms before a hit crystal is hidden whendynamicDelayis off (0-200)dynamicDelay- when enabled, the delay is estimated automatically from your latency instead of usingdelayresync- 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 delayenabled/maxTime
anchorsglowstoneSound- play the charge sound client-sideclientExplosion- show the detonation explosion client-sidereInteract- allow re-interacting with the anchor before the server confirmsghostAnchor- 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 latencyfixedWindowMs- window used whendynamicis falsefloorMs/capMs- lower/upper bounds for the dynamic window
Disclaimer
Allowed on servers such as:
PvPClubFadedMCTurtledCatPvP
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
Is this likely to break the desynchronization of the client-server tick loop?
No. This desynchronization is simulated by an artificial time delay of half a tick.
Am I going to flag the anticheats?
This mod is designed to not trigger anticheats.
The way it works is by only adding the entities client-side when they are rendered and at the moment of their ticking, without letting them interacting with anything real.
So no, you won't if you use the recommended versions.
Note: I played for months with this mod and I have never been banned
Which branch should I install?
- Release versions are safe to use
For a casual player, release versions are recommended.
Is Eslium available for other Minecraft versions?
Yes, a 1.16.5 backport is available.
Compatibility
Eslium should work on any client.
Project description from Modrinth.
Pick your setup
Eslium Backport by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.16.5
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Eslium Backport versions and loaders
4.6.0
clienthings-4.6.0.jar
12 Oct 2026
4.0.5
clienthings-4.0.5.jar
12 Oct 2026
4.0.4
clienthings-1.0.0.jar
11 Oct 2026
4.0.3
clienthings-1.0.0.jar
28 Sept 2026
4.0.2
clienthings-1.0.0.jar
26 Sept 2026
4.0.1
clienthings-1.0.0.jar
9 Aug 2026
Looking for an older file? The official Modrinth project page is in Resources.