I have turned off all my command blocks and the LAG disappears. Anything that changes the scoreboard (or perhaps anything that engages with it) causes extreme LAG via the mobs, regardless if that particular mob is affected (involved) or not.
Whether scoreboard is the only thing causing the LAG in my world or not, free to add to this if anything new or relevant appears.
Mobs' movements become jagged instead of smooth.
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I actually found something that is interesting in the latest log file. It repeats that first bit three times then proceeds to that next bit (on the file I attached) Unfortunately my world was too big (using it for many versions now ) and the original log file was unusually big.. Let me know if you need anything else. It also keeps telling me that commands fail even though I thought LogAdminsCommands was supposed to prevent it from logging those. Which I checked and the gamerule says its indeed false. So I believe that much of this is causing the problem. Hope this all helps! Make it private if you need to, I don't think you need to though, not sure.
Do you have any incompatible software? What's your OS and your system specs?
i added the specs, I also added up there for you that I do not have a modded client. If you need anything else let me know! All I know is that the game is logging commands made by the various command blocks I have going even though LogAdminCommands is false. And it can't seem to find some important file.. not sure what that's about. Not sure if that's the whole problem or not either.
Edit: To ask if maybe they need to update the launcher? I was thinking that maybe it wasn't downloading everything correctly..
Edit 2: To not add another comment under my own. I think it has something to do with the execute command! Because I took my region files placed in a recreated world of that world (same seed) Everything was fine! Started converting the commands in the blocks turned them on Everything was great! Then out of no where after I converted a different set of execute commands (in a chain) It started (lightly) geeking out so I turned them off and it didn't change! Everything is "corrupt" again. It's really bizarre but like I said i think it's because the execute command and that it keeps logging them even though the gamerule for logadmincommands is false. Oh and for some reason these later snapshots are taking absolutely forever to load the game, I can see it crashing more easily now. Hopefully they are aware of that and the newer snapshots will already have a fix. I gather they aren't done yet, so methinks that will fix my problem, hopefully..
Please re-create your command block setup in a small world that's not too big to be shared so we can look into it. Currently with that little information nothing can be done.
Oh, sorry then. It seems to only be noticeable in an old version world that has been updated. I tried it again in a new one and nothing really changed. I have other commands going in my world and I think my computer just can't handle it I guess. The execute command is very resource heavy when used in a chain command block system, i gather. Aw well. Both of my worlds that have this issue, I had for a long time, they are huge now. Even taking the region file and copying it to new world in regions folder, the issue doesn't show, at least not to my knowledge.
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report (minecraft/crash-reports/crash-<DATE>-client.txt) here.
Can you attach the world here? (you can make the ticket private if you'd like)