1c20143e3c
Replace WeakHashMap with an ArrayList and manually manage object lifecycle. Gives superior iteration performance at a slight cost to removal performance and also ensures entities are removed immediately upon losing their validity within the world. Additionally, change listener registration to be done upon world add instead of immediate up creation. This provides benefit of only registering and ticking real Navigation objects, and not invalid entities (cancelled entity spawns for example).
Paper 
High performance Spigot fork that aims to fix gameplay and mechanics inconsistencies.
IRC Support and Project Discussion
How To (Server Admins)
Download a copy of Paperclip.jar from our buildserver here: https://ci.destroystokyo.com/job/PaperSpigot/
Run the PaperClip jar directly from your server. Just like old times
PaperSpigot requires Java 8 or above.
How To (Compiling From Source)
To compile PaperSpigot, you need JDK 8, maven, and an internet connection.
Clone this repo, run ./build.sh --jar from bash, get files.
Leave off --jar if you only wish to resync your checkout and not create a paperclip jar file just yet.
Special Thanks To:
YourKit, makers of the outstanding java profiler, support open source projects of all kinds with their full featured Java and .NET application profilers. We thank them for granting PaperSpigot an OSS license so that we can make our software the best it can be.