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When players are moving in the world, doing things such as building or exploring, they will commonly go back and forth in a small area. This causes a ton of chunk load and unload activity on the edge chunks of their view distance. A simple back and forth movement in 6 blocks could spam a chunk to thrash a loading and unload cycle over and over again. This is very wasteful. This system introduces a delay of inactivity on a chunk before it actually unloads, which is maintained separately from ChunkGC. This allows servers with smaller worlds who do less long distance exploring to stop wasting cpu cycles on saving/unloading/reloading chunks repeatedly.
Paper 
High performance Spigot fork that aims to fix gameplay and mechanics inconsistencies.
IRC Support and Project Discussion
Documentation
Access the paper docs here: paper.readthedocs.io
How To (Server Admins)
Paperclip is a jar file that you can download and run just like a normal jar file.
Download a copy of paperclip.jar from our build server, here.
Run the Paperclip jar directly from your server. Just like old times
Paper requires Java 8 or above.
How To (Compiling Jar From Source)
To compile Paper, you need JDK 8, maven, and an internet connection.
Clone this repo, run ./paper jar from bash, get files.
How To (Pull Request)
See Contributing
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 Paper an OSS license so that we can make our software the best it can be.