Hi, I'm currently working on a custom world generator using the bukkit api. This generator in particular is very cpu heavy and unoptimized at the moment. While generating new chunks my world generator uses all resources available to the jvm, causing the entire server to be occupied with just generating new chunks, causing the game to be unplayable. While you'd think this would cause the jvm to use all available cpu power of my workstation, it doesn't appear to do so. Bukkits world generator api appears to be using all available threads of my cpu, but it barely reaches 60% at its peaks in windows taskmanager. Could anyone explain to me why, while the jvm is completely occupied with just generating new chunks, my cpu seems to be having plenty of resources left to increase server performance if they were assigned to the jvm. The lag caused by chunk generation is not an issue for me as im planning to pre-generate any world im going to use, i'd just like generation to go faster if it could . Thanks for helping out!