Hibernate
Hibernate is a very simple plugin I use in all my servers. It will reduce CPU usage to about 0-1% when no players are online on the server. This can be used for a lot of purposes.
This plugin will only be useful for small servers that tend to be empty at night or during schooldays. If you've got 500 players, the plugin will never "enable" and will not make any difference.
Features
- Save electricity (if you host the server)
- Let other software use the CPU when no one is playing Minecraft.
- Allow more servers to run on your machine
- Works for all versions of Craftbukkit or Spigot
- Very lightweight plugin. Does not cause any lag at all.
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How does this work?
The plugin will intentionally "lag" your server while no players are connected. You can see it as freezing the server. It'll make it dormant until a player connects.
Example
Server with no players online, without Hibernate: 
Server with no players online and Hibernate installed: 
Updates
This plugin requires very little updates. It should work on all Minecraft versions newer than 1.7.x. If you have remarks on this plugin, please contact me on SpigotMC as I'm not very active on Bukkit any more. https://www.spigotmc.org/resources/hibernate.4441/
Comments
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WoutWoot Owner
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Posted Feb 23, 2015@deluxghost
It will make the main server thread sleep one second every server tick. Wich means the server will run very slowly. This reduces CPU usage. I don't really know how else to explain it.
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Posted Feb 22, 2015what is "intentionally lag" server?