Lately I had hude lags coming from entity PigZombie (for short periods of time), but I couldnt find them anywhere in the game. This time I noticed something strange. Group of players was travelling in the Nether and then they teleported to overworld. Immediately tps starts to drop. First 20 sec after they left Nether https://timings.spigotmc.org/?url=lihoritaru, more time https://timings.spigotmc.org/?url=hahoyadeju https://timings.spigotmc.org/?url=gurixilafe Lags come from tickEntity - EntityPigZombie nether - doChunkUnload No players were in the Nether during lags. Then I entered Nether and lags gone. Is it some map corruption? And how to fix it? Does "repair region" option in MCEdit will help?