[MC-143331] Server lag when players are too far apart

When players move too far apart while on a dedicated server, the server will lag uncontrollably until either one player moves closer or disconnects.

What I expected to happen was...:
Server would be unaffected.

What actually happened was...:
Server lag was so great the game was rendered unplayable.

Steps to Reproduce:
1. Teleport or move one player more than 1000 blocks in any direction.
2. Server will lag and drop clients.

Linked issues

is duplicated by 1

MC-143650 Snapshot server have extreme lags with 3 players Resolved

Comments 9

Uriel Salischiker 2019-01-30T21:20:26Z

What are the server specs? Sounds like it cant keep up with the view distance set

Chris L 2019-02-01T07:09:33Z

Urielsalis,

The server is equipped with 16GB memory and a full AMD Ryzen 5 1600x.

Paul 2019-02-02T08:53:23Z

I have the same problem, changing the amount of memory almost does not change the situation, sooner or later the lags begin. No such problem was found on version 19w02a, all subsequent versions have this bug.

Chris L 2019-02-02T10:26:00Z

so it seems like it is a snapshot issue then. Let's hope this gets noticed and fixed

Chris L 2019-02-03T09:48:13Z

mine goes to 4000ms and the RAM fills up to 8GB. so will Mojang see this eventually it does this need to get a lot of replies?

Johnibur 2019-02-03T19:47:09Z

Could you identify what's ticking too long? Reproduce the lag situation, then start a debug profiling with the command:

/debug start

Let the profiler run while the server is being overloaded. Then stop with "stop" argument. Watch and report any console output (what's taking too long?). Then you go to the debug folder in your server's folder and read or join the debug profiling.

YouShouldBeAshamed 2019-02-03T20:18:05Z

Confirmed, I noticed this while playing Templex, a 19w05a server.

Chris L 2019-02-03T20:57:41Z

Will try John. If I can get the server to execute commands I'll try.

Adrian Östergård 2019-04-04T08:35:06Z

Is this still an issue in 19w14a?