There are 5 repositories under minecraft-performance topic.
Just a list of useful mods
Blazingly fast world manipulation for artists, builders and everyone else: https://www.spigotmc.org/resources/13932/
Blazingly fast world manipulation for artists, large networks and developers: https://www.spigotmc.org/resources/13932/
✨ "Ooooh, sparkly paper!" - SparklyPower's Paper fork, making large servers snappier with high-performance optimizations and improvements!
🥡🤖 Nightly builds of the Folia server jar, ready-to-use, right here
Optimised minecraft server configs for purpur, paper, spigot, airplane, purfferfish.
HoneyBEE is a Minecraft server implementation written in go, with help from wiki.vg (huge thanks to them), that aims to be fast by utilising go-routines and being optimised for a low cpu/ram footprint. (Pre-Alpha)
Simple launcher for the Minecraft Minestom server.
High performance PaperSpigot fork used by Minecraft Server Cloudz.ml.
A simple minecraft server software.
All your plugin needs...
Reduce performance consumption of Minecraft when the window is not focused
High-Speed Minecraft Server written in C
This plugin tries to optimize user experience with naturally spawned entities by restricting where an entity can spawn. Only entities that (can be seen)/seen by a player will be spawned.
unofficial hourly Tuinity builds