CurseForge · Minecraft mod

Create FastTrack

A tiny standalone Forge 1.20.1 mod that fixes a performance hot-spot in Create's railway code by applying the track-network flood-fill optimisation to the published Create mod.

Choose a version Pick your version below, then grab the matching file.

Quick answer

Which Create FastTrack release should I use?

Updated 11 days ago

Latest stable file trackfastrack-1.0.0.jar

Game version 1.20.1

Loader Forge

Create FastTrack trackfastrack-1.0.0.jar targets 1.20.1 with Forge. The project page does not say whether this file belongs on the client, dedicated server, or both. All 1 required mods have matching files.

Where it goes

Is Create FastTrack 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 Forge

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 Create FastTrack trackfastrack-1.0.0.jar need?

trackfastrack-1.0.0.jar. Change the file and its required mods may change too.

All 1 required mods have matching files

Install Create first. We found matching files for this game-version and loader setup.

Create Needed by Create FastTrack trackfastrack-1.0.0.jar

required

Matching file found Matched file: Create 6.0.8 for mc1.20.1

We only count dependency files that match this setup. A file for another loader does not fill the gap.

Before you install it

Add Create FastTrack without breaking your instance.

Built for Create FastTrack trackfastrack-1.0.0.jar. Pick another file and the loader, install side or required mods may change.

01
Stick to this file

Use trackfastrack-1.0.0.jar. It targets 1.20.1 with Forge; another release may have different loader, side or dependency requirements.
02
Bring the mods it needs

Install Create first. We found matching files for this game-version and loader setup.
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 trackfastrack-1.0.0.jar. It opens that exact file at the source.

About this project

What does Create FastTrack add?

TrackFastRack

A tiny standalone Forge 1.20.1 mod that fixes a performance hot-spot in Create's railway code by applying
the track-network **flood-fill optimisation** to the published Create mod — no forked Create needed.

The problem

Whenever a track is placed or broken, Create's TrackGraph#findDisconnectedGraphs runs a connected-component
flood fill over the entire rail network. In released Create (≤ 6.0.8) the BFS frontier is an ArrayList, and
popping from the head via ArrayList#remove(0) shifts the whole backing array on every pop — making the flood
fill O(n²).

On a large rail network (~80k nodes), a single track modification can walk **billions of elements**, causing
noticeable stutter and lag spikes while building or rerouting long train lines.

The fix

This mod injects a single Mixin that replaces the frontier with an ArrayDeque (poll() is O(1)) and swaps
stream().findFirst() for a plain iterator, turning the flood fill into **O(n)**. The change is a faithful port
of Create fork commit 272e97604 ("Optimise train network hot paths").

Verify it's working

On game start the mod logs TrackGraph flood-fill self-test OK, proving the optimised method bound correctly at
runtime.

Project description from CurseForge.

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