[MC-132259] Poor TPS in latest pre-release

The bug

The average ticks per second in the latest pre-release is lower than usual. Old worlds as well as new worlds are affected. This was not an issue in 1.13-pre4.

This can be reproduced by using /debug or lighting TNT and observing the delay for it to explode. Eating food also takes a while.

Linked issues

is duplicated by 4

MC-132329 Game can't keep up with normal game tick rate Resolved

MC-132402 Mob motion slow and jittery Resolved

MC-132559 Underwater block lag Resolved

MC-132584 Slower game ticks Resolved

Attachments

Minecraft 1.13-pre5 28.06.2018 19_14_26.mov

profile-results-2018-06-29_18.29.05.txt

Comments 23

qwerty23495 2018-06-28T17:28:02Z

This is happening because your server is running at a slower tickrate.

Rick Kralt 2018-06-28T17:36:34Z

Happens to me too.

It seems like the further away you are the longer it takes to explode.

qwerty23495 2018-06-28T23:32:03Z

Generating chunks has always been an intensive process. It takes more time for the server to process more events with chunk generation.

Piyotato 2018-06-28T23:59:06Z

I'm getting about 10-15 TPS on a world that has nothing going on. I'm pretty sure this is a bug, an a huge bug as well.

Warren Liddell 2018-06-29T00:50:37Z

Despite what Matthew is claiming, i have noticed quite poor performance with pre5 as apposed to any of the other pre's and thats noticeable with only a few people online and when you get to 20 odd users, the screaming of lag is quite real. And with majority of users on my server all ready having a base and nether and the end being quite explored for the size of the map we have, its certainly nothing to do with new chunk generation.

13 more comments

Greg Milson 2018-06-29T13:33:44Z

Someone really needs to be assigned to this because this issue is game breaking and will affect a lot of servers.

Jakob Knigga 2018-06-29T13:45:16Z

I was about to open a ticket, but I think what I saw might be related. When eating, the animation finishes before the game counts the food as being consumed. It takes about another second after the animation for it to take affect.

Piyotato 2018-06-29T13:53:35Z

TPS at 15 on a superflat world... :/

qwerty23495 2018-06-29T14:53:45Z

Do you have a cause for this issue? Saying that there is bad TPS gives Mojang nothing to go on towards fixing this issue.

Also, can confirm some TPS issues.

Jakob Knigga 2018-06-29T15:25:45Z

I attached a gif showing eating food. The first time I release the mouse button after the animation. The second time I continue to hold it.

qwerty23495 2018-06-29T15:35:15Z

Sounds like a duplicate of MC-131614

Greg Milson 2018-06-29T15:59:24Z

We could also add the debug text file so they can see what is causing all the lag.

Jakob Knigga 2018-06-29T18:01:24Z

I don't think it's a duplicate of MC-131614

The server admin checked the logs and there were no errors or warnings. The server is acting just fine, it's just running at ~15 TPS.

ElectroBleach 2018-06-29T18:46:00Z

There is an indubitable TPS bug in this pre-release. I've been getting ~16TPS in empty superflat worlds while having my render distance set to 17. When setting my render distance to two, I receive ~18.5TPS. A friend of mine tested their TPS in a superflat world and got similar results. When in one of my maps – which utilizes mainly functions for mechanics – I get 6TPS on average; this would run at 20TPS beforehand. This didn't seem to occur during any of the previous pre-releases.

Fen Dweller 2018-06-29T20:54:11Z

I'm observing this on my server. Food is taking a moment longer than it should to eat, and I've noticed some laggy feelings in general. The server is not complaining about being unable to keep up.

qwerty23495 2018-06-29T20:59:45Z

Jakob Knigga,

The server won't spit out those messages unless the debug mode is on. Using /debug start you can see processes that are taking too long and overloading the server (/debug stop to generate a report and see tickrate). The server isn't acting fine when it is running 25% slower than usual consistently.

qwerty23495 2018-06-29T21:11:49Z

I did some further testing by comparing the debug profiler results of the same world in pre-release 4 and pre-release 5 under similar conditions for about two minutes. It looks as if there is nothing out of the ordinary that is causing an extreme amount of lag.

[media]

Avantir_Yihn 2018-06-29T22:57:56Z

I'm experiencing this issue too. The server is just running slower than it should, and it's messing up the timings of everything. No client lag at all.

Jakob Knigga 2018-07-02T14:15:18Z

@Matthew Hunter - I was using debug mode. Either way, your post comparing the two pre-releases is exactly the problem. Nothing is lagging, the TPS is just lower.

Kristian Spangsege 2018-07-02T16:46:09Z

Seeing the same thing here. No lag on client side. Server runs at very low tick rate. Eating takes a long time. Mobs move slowly and jittery. None of the usual suspects seem to be at play in this world (no redstone or other mechanical contraptions). The lag started to occur shortly after switching from 1.13-pre4 to 1.13-pre5.

Rob DeWolf 2018-07-02T23:00:08Z

Also experiencing this. Thought it was weird when I saw pufferfish jolting forward. Checked out other mobs, same thing. Ran /debug, and now running 9-10 TPS, when I was hitting 19+ before (server is nearing completion, so no other players on atm).

Nothing has changed on my end, except upgrading to pre-5. Client side, everything seems fine except for eating food, and seeing mobs move slowly.

Also, restarted the server to clear up any issues that may have caused. Was at 9 TPS the moment I logged on.

Nagy Richárd 2018-08-15T15:31:05Z

This is again in 18w33a.

Nagy Richárd 2018-08-16T16:21:25Z

and 1.13.1-pre1