Right after preparing spawn for all 3 dimensions, spigot freezes and does not respond to any connection or commands, and it gives a bunch of errors and stop itself. I have tried several world files and none of them work, they all work in vanilla server.

original issue:  https://hub.spigotmc.org/jira/browse/SPIGOT-5874

As you said my J1900 is too slow for the server, i did it on my pc and the same problem happens

my pc has an i5 4670 which should be fast enough to run it

(see the attached image)

thank you a dozen for checking this and making us spigot