Paul C

I believe I have recreated this issue by trapping ghasts in boats. I'm trying to build a ghast farm, and as soon as 1 ghast is trapped in a boat and a second ghast spawns, there is significant lag created. The game becomes unplayable, as player movements are completely unreliable. Bow/arrow fires about 5 blocks max when fully drawn (and float away instead of firing), it takes 30 seconds and many sips to drink a single potion or eat food, firework rockets do not fire properly making elytra travel impossible, blocks/items that are broken, dropped, or picked up have about 10-15 second delays. As soon as the ghasts are killed, the extreme lag disappears and all returns to normal.

I can verify this issue still present in 19w11 snapshot.