yes, the title may sounds like clickbait, but it is done. With the help of FAWE it takes on my poor home server only 1 seconds to create a world - and it is completely async. As you have heard, you will need for this FAWE and WorldEdit to work. Otherwise it will the create the worlds like before. I am trying to do this without the help of FAWE. Special thanks to Schrand for showing this feature to me. Link to issue