Eaglercraft Studio

CoreSwap — a C++ rewrite of Minecraft's worldgen

Creator: unknowbug · 2026-09-03 · Mods · Free on Eaglercraft Studio

Download CoreSwap — a C++ rewrite of Minecraft's worldgen — free Minecraft mod. Created by unknowbug. Tagged functional. Check the file details for Forge, Fabric, or NeoForge before installing.

CoreSwap — a C++ rewrite of Minecraft's worldgen preview

Creator notes

What it is: CoreSwap rewrites Minecraft Java Edition's performance-critical cores — world generation and entity AI/pathfinding — in C++, while keeping the full Java mod ecosystem intact. Same seed. Same world. Same mods. The C++ goes underneath. Why: Java Edition's performance has been a meme for two decades. Every existing fix has a fatal flaw:[td][table background=null] [tbody] [tr] [td width=]Approach[/td] [td width=]Flaw[/td] [/tr] [tr] [td]Paper & optimization plugins[/td] [td]Still Java — treats symptoms, not causes[/td] [/tr] [tr] [td]Cuberite (full C++ rewrite)[/td] [td]Fast, but the mod ecosystem dies[/td] [/tr] [tr] [td]Switch to Bedrock[/td] [td]Ecosystem gone, version drift forever[/td] [/tr] [/tbody] [/table]CoreSwap walks the path nobody has walked: [b]C++ performance core + Java mod layer (JNI bridge)[/b] — the mod API stays Java and untouched; everything below it is free to become C++.[b]v1.0.0 (MC 1.20.1, Fabric):[/b][list] [*]✅ [b]NOISE+SURFACE (density / aquifer / ore veins / surface rules) 100% bit-identical to vanilla[/b] — same seed, same terrain, block-for-block (exact IEEE double)[/*] [*]✅ [b]10-20× faster worldgen[/b]: batched parallel generation (~3 ms/chu

Functional

Added value

What’s included on this page

Preview, categories, compatibility, and tools on this page — not a bare file mirror.

Creator
unknowbug
Source
Minecraft downloads library on Eaglercraft Studio
Type
Minecraft mod
Price
Free download on Eaglercraft Studio
Curation
Listed with credit to unknowbug · studio preview & install guide
Game Version
Minecraft 1.20.1
Compatible with
Minecraft Java (match version / loader in facts)
Tags
Functional

Install guide

How to install this free Minecraft mod

Eaglercraft Studio listing with metadata, creator credit, and loader-aware install guidance.

  1. 1Download the jar/zip when available.
  2. 2Install the matching loader (Forge, Fabric, or NeoForge) for your Minecraft version.
  3. 3Drop the mod into your mods folder, then launch with that profile.

Wrong loader or game version usually crashes on startup — read the facts on this page first.

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