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If the server lags out and skips multiple ticks, Furnace cooking behavior would not cook in the expected amount of time as the cook time was not decremented correctly. This patch ensures that furnaces cook to the correct wall time expectation.
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.