I'm having the same issue. Any time someone enters a nether portal the server lags for a few seconds-mins. Sometimes the loading screen to the nether takes 5 mins. A few times when someone has entered the nether they have crashed the server. I also noticed mobs are not despawning.
I'm having the same issue. Any time someone enters a nether portal the server lags for a few seconds-mins. Sometimes the loading screen to the nether takes 5 mins. A few times when someone has entered the nether they have crashed the server. I also noticed mobs are not despawning.