Region regenerator improvements:
Tested with an 250x256x250 arena that's fully filled with blocks (16384000 (!!!) blocks) on PaperSpigot 1.16.5. Improvements may vary on a different version.

Improvements in speed: ~300%
Improvements in performance: ~286%

Before:

Now with this update:




Added configs:

• coins-give-killplayer-final
  
• block-spreading-enabled

Miscellaneous:

• Improved region regenerator on 1.16.5 - 1.14
  
• Paper 1.14: Added support for chunk offthread chunk loading, Spigot: 1.14+ "async" chunk loading (still gets loaded in main thread, but not only in the same tick anymore)
  
• Spigot&Paper 1.14: Keep all chunks loaded during regeneration
  
• Made region regenerator more efficient

Fixed bugs:

• Fixed 1.8-1.10 error when using guarddog or minishop https://pastebin.com/JyRnH4Pq
  
• Fixed possible error when trying to parse potion type via its numeric id https://pastebin.com/qZV8sEvV
  
• Fixed lobbybreak config causing items to drop
  
• Fixed region regenerator cutting off too much when a coordinate is in the negative
  
• Fixed not saving a block in the corner of the arena region
  
• Fixed death spectators being able to pick up items with smart item sharing
  
• Fixed arenas state changing to lobby after regeneration even if it has problems