CurseForge · Minecraft mod

Async Chat Ported

AsyncChat-Backport - A non-official backport of Async Chat mod to Minecraft 1.20.4, fixing chat-related freezes by processing messages on a dedicated background thread.

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Quick answer

Which Async Chat Ported release should I use?

Updated last month

Latest stable file async-chat-1.20.4-1.2.0.jar

Game version 1.20.4

Loader Fabric

Async Chat Ported async-chat-1.20.4-1.2.0.jar targets 1.20.4 with Fabric. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.

Where it goes

Is Async Chat Ported required on the client, server, or both?

The project page does not say whether this file belongs on the client, dedicated server, or both.

Client Source doesn’t say

Dedicated server Source doesn’t say

Loader for this release Fabric

Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

The source does not explicitly classify this release as client-only or server-only.

Understand client and server requirements Read the Minecraft installation guide

What else does Async Chat Ported async-chat-1.20.4-1.2.0.jar need?

async-chat-1.20.4-1.2.0.jar. Change the file and its required mods may change too.

No extra mods listed for this file

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 Async Chat Ported without breaking your instance.

Built for Async Chat Ported async-chat-1.20.4-1.2.0.jar. Pick another file and the loader, install side or required mods may change.

01
Stick to this file

Use async-chat-1.20.4-1.2.0.jar. It targets 1.20.4 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

The project page does not say whether this file belongs on the client, dedicated server, or both.
04
Pick the file you checked

Use the “Get this file” button beside async-chat-1.20.4-1.2.0.jar. It opens that exact file at the source.

About this project

What does Async Chat Ported add?

📖 Overview

In vanilla Minecraft, chat message processing—including receiving, parsing, formatting, and security checks—is executed synchronously on the main rendering thread. When network latency is high or the server responds slowly, these operations can block rendering, causing noticeable frame drops, freezes, and "spike" frame times—especially in multiplayer environments where messages are frequently exchanged.

This mod solves that problem by offloading all chat processing to a dedicated background thread.

🔄 What Has Changed in 1.20.4?

The original Async Chat mod targeted an older Minecraft version where the primary chat interception point was the handleChatMessage(PlayerChatMessage, ChatType.Bound) method.

In Minecraft 1.20.4, Mojang has removed this method and replaced it with a new signature:
handlePlayerChatMessage(...) which now includes a GameProfile parameter. This change reflects internal updates to how player identity and chat types are managed.

⚙️ How It Works

Interception – When a chat message arrives from the server, the mod intercepts it immediately.
Offloading – The message is handed off to a separate background thread.
Async Processing – All expensive operations (parsing, validation, history updates, etc.) run asynchronously on this background thread. The main rendering thread remains uninterrupted, ensuring smooth and consistent FPS.
Safe Rendering – Once background processing is complete, only the thread-safe rendering data is passed back to the main thread for a lightweight UI update. The chat message appears with minimal performance impact.

📜 Credits & License Compliance

Original Project: totorewa/async-chat-mod: Stop render lag by processing chat messages on a separate thread

This Backport: Based on the original work but adapted for Minecraft 1.20.4

License: The origin project licensed under the MIT License.My project licensed under the GNU General Public License v3.0.

Important: This is an independent backport and is not affiliated with the original author. All credit for the core concept belongs to totorewa.

Project description from CurseForge.

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