80dcb6c4a3
Mojang included some sanity checks on arguments passed to the BlockData. This code results in the Hash look up occuring twice per call, one to test if it exists and another to retrieve the result. This code should ideally never be hit, unless mojang released a bad build. We can discover bugs with this as furthur code that never expects a null would then NPE, so it would not result in hidden issues. This is super hot code, so removing those checks should give decent gains.
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.