Mirai

Features

30% faster hoppers over Paper.
Improved entity performance from a reduction in ticking entity behavior based on how far away they are from the player.
Reduced GC times & frequency from removing useless allocations, which also improves CPU performance.
Reduced bandwidth consumption from avoiding sending useless entity packets.
Fast raytracing which improves performance of any entity which utilizes line of sight, mainly Villagers.
Built-in profiler which has 0 performance hit and easy to read metrics for both server owners and developers.
Faster crafting, reduction in uselessly loaded chunks, entity ticking, block ticking, bat spawning…
New NBT cache which reduces a lot of I/O operations from the main thread while preserving correct data.
Pre-tweaked configuration files to reach optimal performance with minimal impact on normal behaviors.
IP and login location hiding feature, which adds another security layer in the logs.
Removed metrics, no one can collect data, not even us.
Bugfixes for several Minecraft issues.
Safer methods for Vanilla calls.
Plugin compatibility with Spigot & Paper plugins.

The latest JAR file can be downloaded from the release/1.17 branch. You can also clone this repository and build it yourself.

If you are interested in making a fork, check out this template here!

If you want to avoid the patching system:

./gradlew clean applyPatches && ./gradlew build

Otherwise, in order to distribute, you need a paperclip file:

./gradlew clean applyPatches && ./gradlew paperclipJar

Patches are licensed under GPL-3.0.
All other files are licensed under MIT.