Stable Performance vr1.4.0

HeroSync

Latency compensation that makes high-ping gameplay feel local.

Stable · Released and maintained — r1.4.0 across 1.21–1.21.11 and 26.x. Built from 100 specification documents with a fully modular engine.

What's new

Latest in HeroSync

Full changelog

1.4.0 Latest 2026-08-01 Release

Reconciliation & rollback refinements

Expanded version matrix to 1.21.11 and 26.x
Improved rollback precision
Developer API additions

1.3.2 2026-06-12 Release

Stability pass

Fixed rollback edge cases on high-latency servers
Reduced per-tick cost

See it in action

HeroSync vr1.4.0 — the real thing, not a mockup

No demo video — run it yourself

We do not publish mockups as proof of working software. This page describes build r1.4.0: launch it, follow the tutorial step by step, or read the docs — every claim links to something you can execute today. Recorded walkthroughs are tracked on the roadmap.

Follow the tutorial instead

Why it exists

Purpose

Network latency makes otherwise-fine gameplay feel heavy. HeroSync removes that feeling client-side: your actions register instantly, then reconcile with the authoritative server — rolling back cleanly when the server disagrees.

Who it's for

Players on high-ping servers, everyone who wants a smoother-feeling game, and anyone who wants less perceived lag without server mods.

Key capabilities

Instant action registration

Player actions are registered locally at zero latency, so the game responds immediately.

Smart reconciliation

Outbound and inbound packets are observed and reconciled against server truth.

Clean rollback

A dedicated rollback engine reverses only what needs reversing when server state differs.

Broad version support

Shipped for every version from 1.21 to 1.21.11, plus experimental 26.x builds.

Features

HeroSync — feature registry

9 features across 3 categories — all real, all working.

Latency Compensation 4 features

Instant Action Registration

Player actions are registered locally at zero latency.

Smart Reconciliation

Outbound and inbound packets are observed and reconciled against server truth.

Clean Rollback

A dedicated rollback engine reverses only what needs reversing.

Snapshot System

State snapshots for consistent rollback points.

Configuration 3 features

Feature Toggles

Individual features and the whole framework can be disabled.

Command Interface

/herosync exposes status, transactions, toggles, stats and debug overlay.

Debug Overlay

F3+L shows live latency compensation diagnostics.

Developer 2 features

HeroSyncAPI

Registration rules, packet classifiers, snapshot providers.

Compatibility Adapters

Adapters for common mod interactions.

Quick start

Get started with HeroSync in minutes

Follow these steps — most installs take under five minutes.

Step 1

Download the HeroSync JAR for your exact Minecraft version (1.21 → 1.21.11 published; 26.x experimental).

Step 2

Place it in your Fabric mods folder (Fabric API recommended) — nothing to install server-side, ever.

Step 3

Join any server — actions now feel responsive immediately; the reconciliation engine works silently in the background.

Step 4

Open the in-game settings screen to tune or disable individual features, or edit config/herosync.json (created after first launch).

Step 5

Press F3+L to toggle the debug overlay and confirm the framework is active on your current server.

Step 6

Use /herosync status and /herosync stats to inspect current state, transactions and per-tick cost.

Step 7

Run /herosync reload after editing config/herosync.json to apply changes without restarting.

Step 8

Keep the JAR matched to your Minecraft version for best results — 26.x builds are bundled-mappings and experimental.

Full HeroSync tutorial Documentation Download now

Compatibility

Versions & loaders

Property	Value
Loader / platform	Fabric
Latest version	r1.4.0
Minecraft versions	1.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4, 1.21.5, 1.21.6, 1.21.7, 1.21.8, 1.21.9, 1.21.10, 1.21.11, 26.1, 26.1.1, 26.1.2, 26.2

26.x builds are experimental (bundled-mappings).

Version history

Changelog

1.4.0

2026-08-01 Release Latest

Reconciliation & rollback refinements

Expanded version matrix to 1.21.11 and 26.x
Improved rollback precision
Developer API additions

Warning. 26.x builds use bundled mappings and are experimental

Warning. Check server rules — some communities restrict predictive clients

1.3.2

2026-06-12 Release

Stability pass

Fixed rollback edge cases on high-latency servers
Reduced per-tick cost

Fixed: crash when unloading a chunk during a pending rollback

Roadmap

Where it's going

Multi-version matrix

done

Real builds for 1.21–1.21.11 plus 26.x.

Per-version runtime adapters

Deepen runtime version adaptation beyond build-time matrices.

Hero Client module

later

First-class integration as a Hero Client module.

FAQ

Questions, answered

Does this work on servers without the mod?

Yes. HeroSync is client-side and requires nothing on the server.

Will it get me banned?

It compensates for latency like predictive clients do — it never fabricates confirmations. Always check server rules first; some communities restrict predictive behaviour even when it is client-side.

Which versions are supported?

1.21 through 1.21.11 plus experimental 26.x builds (26.1 → 26.2). Keep the build matched to your Minecraft version.

Does it change my actual ping?

No — it changes how lag feels by making your inputs register locally (0ms perceived delay), then reconciling with the server.

Can I turn it off?

Yes — individual features and the whole framework can be disabled from config/herosync.json, or tuned from the in-game settings screen.

How much does it affect performance?

It keeps a sub-2ms per-client-tick performance budget, even with everything enabled.

Is there a command interface?

Yes — /herosync exposes status, transaction lists, registration toggles, stats, a debug overlay (F3+L) and reload. Run /herosync status to see current state, /herosync transaction list to inspect recent transactions, and /herosync stats for per-tick cost and reconciliation counters.

Can other mods integrate with it?

Yes — it ships a developer API (HeroSyncAPI) with registration rules, packet classifiers, snapshot providers and compatibility adapters.

What happens when the server disagrees with me?

The rollback engine reverses only what needs reversing — backed by state snapshots for consistent rollback points — instead of rubber-banding your whole position.

Compatibility & limitations

What to know

Compatibility. 26.x builds are experimental (bundled-mappings).

Status. Released and maintained — r1.4.0 across 1.21–1.21.11 and 26.x. Built from 100 specification documents with a fully modular engine.

Downloads

Get HeroSync

Pick the JAR matching your Minecraft version.

Fabric mod JAR + sources View Tutorial

Ecosystem

Part of something bigger

Every Hero Studios product is engineered to work with the rest of the ecosystem — one design language, one performance bar, one long-term vision. HeroSync belongs alongside these tools.