Wow, I discovered that there is an AsyncWorldEdit plugin that hooks into the normal WorldEdit plugin: https://www.spigotmc.org/resources/asyncworldedit.327/ Demo: https://www.youtube.com/watch?v=LgE0cXGIu34
I tried pasting the same structure as in the demo on Cuberite, and it only took 3.84 seconds, while when I tried it on a local Spigot server the server crashed after more than a minute.
I tried pasting the same structure as in the demo on Cuberite, and it only took 3.84 seconds, while when I tried it on a local Spigot server the server crashed after more than a minute.