We unload unused worlds on our server to reduce lag.

When a player enters a DimDoor, the server goes through each of these unloaded worlds individually and loads them, presumably your code has some method to see if X dimensions are DimDoors dims or not.

Could you fix this?

Duplicate of #86

Would really be nice if this got more attention though, as on multiplayer this causes timeout issues and then tps lag (along with the server being seemingly unstable afterwards and prone to crashing).