In making minigames I've found that one of the most common tasks you need to perform is saving and loading terrain, maps, etc. and that the most commonly recommended way of doing so is via WorldEdit. This works well for smaller areas and the like, but when you start getting to larger sections of terrain (>1,000,000 blocks) WorldEdit starts to lag the server, often to the point of time out errors. I am going to work on a plugin that allows you to save and load large amounts of blocks without the lag that WorldEdit causes. It wouldn't just be a library, however, it would also be usable by players to save and load schematics. I was hoping to get some help on this project, if anyone is interested please message me or reply below.