I built a ghast farm. It took a long time. Ghasts seem to be bugged with lag when firing, and even when just existing.
To replicate the bug, build a containment unit for ghasts in minecarts. Then, get them to fire at you. If multiple fireballs are in the air at the same time, or if the fireballs are redirected with slime, they cause a lag spike that slows entities in motion, such as minecarts, boats, arrows, fireballs. It should also mess up the day/night cycle, and after stoping the ghast firing, there will still be significant amounts of lag that can make building frustrating.
To stop the world from lagging, you can either unload the chunks, or reload the world. But as soon as they fire again you should notice the bugs described above.
As an added note, my world is around 500 MB, not sure if the world size effects this bug though.
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GoldenHelmet
Does MCPE-101102 describe what you are seeing?
It would help to have a video of what you experience.
[Mojang] Mega_Spud (Jay)
Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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GoldenHelmet
Reopened as this is still an issue. To reproduce:
Trap a ghast in a minecart.
Get the ghast to target a player or another mob.
See https://bugs.mojang.com/secure/attachment/459984/Ghast%20lag%20%28aggro%29.mp4 for a setup to reproduce.
Possibly the same underlying cause as MCPE-147882. Ghasts do not path toward their targets, but they do continue to use navigation behavior (random floating), so the underlying bug may have to do with feedback between targeting and navigation.
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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.
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Just added a few old vids I found of it in my creative test copy, also noticed that day/night cycle would get a little funky
(It would rubber-band between day and night in the worst cases)
Two of the videos relate to the lag in projectiles, one is lag related to players on scaffolding, and one is the delay in redstone produced.
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Thank you for your report!
We're tracking this issue in MCPE-147882, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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I am now experiencing this problem also, i've contained two ghasts while I build a farm in the nether and i can't even fire arrows at skeletons and lava pots take ages to register. as Paul C has said, that pretty much summs it up except I am experiencing this on 1.19, once I leave the active chunk there are no problems.