Large groups of Ravagers cause TPS lag on servers
While testing performance of large groups of mobs, Ravagers stuck out as an issue. Spawning in 100 Ravagers caused server TPS to drop significantly, while 100 of other mobs remained steady at 20 TPS.
Not sure if caused by collision hit boxes, pathfinding (since they can go through some types of blocks), or something else.
Created Issue:
Large groups of Ravagers cause TPS lag on servers
While testing performance of large groups of mobs, Ravagers stuck out as an issue. Spawning in 100 Ravagers caused server TPS to drop significantly, while 100 of other mobs remained steady at 20 TPS.
Not sure if caused by collision hit boxes, pathfinding (since they can go through some types of blocks), or something else.
Added Attachments:
Added Category: Performance
Removed Category: (Unassigned)
Added Affects Versions: 1.16.2-pre1
Added Attachments:
Added Affects Versions: 1.16.2-pre2
Added Affects Versions: 1.16.2-rc2
Added Affects Versions: 1.16.2
Added Affects Versions: 1.16.3
Added Affects Versions: 20w49a
Added Affects Versions: 1.17.1-pre1 1.17
Deleted Comment:
Can confirm in 1.17.1.
Added Affects Versions: 21w40a
Added Affects Versions: 21w42a
Added Affects Versions: 21w43a
Removed Assignee:
[Mojang] slicedlime
Added Affects Versions: 21w44a
Added Affects Versions: 1.18-pre1
Added Affects Versions: 1.18-pre4
Added Affects Versions: 1.18-pre5
Added Affects Versions: 1.18-pre7
Added Affects Versions: 1.18-pre8
Added Affects Versions: 1.18-rc1
Added Affects Versions: 1.18-rc3
Added Affects Versions: 1.18-rc4
Added Affects Versions: 1.18
Added Affects Versions: 1.18.1-pre1
Added Affects Versions: 1.18.1-rc1
Added Affects Versions: 1.18.1-rc2
Added Affects Versions: 1.18.2-pre1

We do not have enough information to find the cause of this issue.
While the lag occurs, please run /debug start, wait a while and then run /debug stop in order to create a debug profile. Afterwards, run /debug report.
If you do not have the permission to run these commands, open your world to LAN and enable cheats. If you're on a server, make sure that you're a server operator in order to execute these commands.
Then, please attach the profile results found in minecraft/debug/profile-results-<DATE>.txt, as well as the debug report found in minecraft/debug/debug-report-<DATE>.zip here.
This issue has been temporarily closed as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.
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Have attached four debug report files/profiles. Using 1.15 pre-7 I get ~15 TPS with 100 Ravagers and 3 players.
It is my test in 1.16.2 pre 2,
I would like to request ownership of this ticket, since reporter has been inactive for more than year. Also this is still a bit problem in 21w40a