On 1.8 my serv could hold 15-20 players with no problems, with 1.9 it could hold 10 with no problems and now with 1.9.4 It loads 30% of cpu with only me online and I was just standing and doing nothing. Here's timings from 1.9 http://i.imgur.com/JBhT4Et.png 70% cpu load with 12 playes online. Now 30%cpu load with only me online. https://timings.spigotmc.org/?url=16388552 Strange optimization, if it consumes more and more with every new version. problem gone with new version of spigot.jar Problem was in wrong chunks unload.