Very Many Players
A Forge mod designed to improve server performance at high playercounts.
VMP is still in early development and things may break. Please report any issues to our issue tracker.
So what is VMP?
Very Many Players, or VMP for short, is a Forge mod designed to improve general server performance at high playercount
without sacrificing vanilla functionality or behavior.
For the best performance it is recommended to use VMP along with Lithium.
How VMP achieves its performance improvements?
This list may contain features currently unreleased and only found in development builds
Server-side game logic performance improvements:
- Uses area maps to optimize nearby packet sending and player lookups
- Uses cache to optimize entity trackers, fluid state lookups, ingredient matching and biome lookup
- Optimizes natural spawning with caches and other tricks
- Optimizes entity tracking with area maps
- Optimizes entity iteration for collisions
- Optimizes ticket propagator using MCUtil from the Paper project (patch licensed under MIT)
- Makes initial chunk loading async on player login
- Makes several commands run async only when issued by a player
Client-side game logic performance improvements:
- Makes time source to use built-in Java time source instead of GLFW via JNI calls
Networking performance & responsiveness improvements:
- Uses our own chunk sending mechanism (optionally with packet-level rate-limiting)
- Adds packet-level per-player render distance
- Makes vanilla tcp connections more responsive using packet priority from raknetify
(works best when the server is connected without reverse proxies such as Velocity and SSH port forwarding) - Mitigates several kinds of bot attacks with split event loops and optimizations
Other improvements:
- Uses AsyncAppender to improve logging performance and keep logging IO off the main thread
... and more
Support
Building and setting up
Requires Java 17 or later, both to build it and to use it.
Use Git to clone this repository, do NOT download zip
Run the following commands in the project directory:
./gradlew clean buildLicense
License information can be found here.