MC-131219Severe input lag in chat on Linux
Severe input lag when typing in chat, with latency increasing as performance decreases. Game controls are unaffected, but "bleed" into the chat if it's opened right after moving, resulting in a "ddddddwwww " style burst in chat. The key used to open chat is also often typed into chat.
The input lag becomes more apparent as game FPS drops / destabilizes.
The issue was never encoutered on any previous versions
Environment
Linux, tested with various distributions and java versions
Created Issue:
Severe input lag in chat on Linux
Severe input lag when typing in chat, with latency increasing as performance decreases. Game controls are unaffected, but "bleed" into the chat if it's opened right after moving, resulting in a "ddddddwwww " style burst in chat.
The issue was never encoutered on any previous versions
Environment
Debian 9 with MATE
![[Mod] Michael Wobst](../../../data/avatars/users/37868.png){kind=small}
![[Bot] Arisa](../../../data/assets/gravatar/mustek2.png){kind=small}
![[Mod] NeunEinser](../../../data/avatars/users/39263.png){kind=small}
Severe input lag when typing in chat, with latency increasing as performance decreases. Game controls are unaffected, but "bleed" into the chat if it's opened right after moving, resulting in a "ddddddwwww " style burst in chat.
The
issue was never encoutered on any previous versionsSevere input lag when typing in chat, with latency increasing as performance decreases. Game controls are unaffected, but "bleed" into the chat if it's opened right after moving, resulting in a "ddddddwwww " style burst in chat. The key used to open chat is also typed out more often than not.
The lag becomes more apparent as game FPS drops / destabilizes.
The issue was never encoutered on any previous versions
Debian 9 with MATE
Linux, tested with various distributions and java versions
Severe input lag when typing in chat, with latency increasing as performance decreases. Game controls are unaffected, but "bleed" into the chat if it's opened right after moving, resulting in a "ddddddwwww " style burst in chat. The key used to open chat is also
typed out more often than not.The lag becomes more apparent as game FPS drops / destabilizes.
The issue was never encoutered on any previous versions
Severe input lag when typing in chat, with latency increasing as performance decreases. Game controls are unaffected, but "bleed" into the chat if it's opened right after moving, resulting in a "ddddddwwww " style burst in chat. The key used to open chat is also often typed into chat.
The lag becomes more apparent as game FPS drops / destabilizes.
The issue was never encoutered on any previous versions
Severe input lag when typing in chat, with latency increasing as performance decreases. Game controls are unaffected, but "bleed" into the chat if it's opened right after moving, resulting in a "tddddddwwww " style burst in chat. The key used to open chat is also often typed into chat.
The lag becomes more apparent as game FPS drops / destabilizes.
The issue was never encoutered on any previous versions
Severe input lag when typing in chat, with latency increasing as performance decreases. Game controls are unaffected, but "bleed" into the chat if it's opened right after moving, resulting in a "
tddddddwwww" style burst in chat. The key used to open chat is also often typed into chat.The lag becomes more apparent as game FPS drops / destabilizes.
The issue was never encoutered on any previous versions
Severe input lag when typing in chat, with latency increasing as performance decreases. Game controls are unaffected, but "bleed" into the chat if it's opened right after moving, resulting in a "ddddddwwww t" style burst in chat. The key used to open chat is also often typed into chat.
The lag becomes more apparent as game FPS drops / destabilizes.
The issue was never encoutered on any previous versions
Severe input lag when typing in chat, with latency increasing as performance decreases. Game controls are unaffected, but "bleed" into the chat if it's opened right after moving, resulting in a "ddddddwwww
t" style burst in chat. The key used to open chat is also often typed into chat.The lag becomes more apparent as game FPS drops / destabilizes.
The issue was never encoutered on any previous versions
Severe input lag when typing in chat, with latency increasing as performance decreases. Game controls are unaffected, but "bleed" into the chat if it's opened right after moving, resulting in a "ddddddwwww " style burst in chat. The key used to open chat is also often typed into chat.
The input lag becomes more apparent as game FPS drops / destabilizes.
The issue was never encoutered on any previous versions
![[Mojang] Nathan Adams](../../../data/assets/gravatar/dinnerbone.png){kind=small}
![[Mod] ampolive](../../../data/avatars/users/18949.svg){kind=small}
Relates to MC-65587 and MC-225777
Possibly related to MC-131219, however, that bug takes place when you open chat; this is once you've hit enter to put something in the chat.
The bug
Often, I want to make a note to myself in singleplayer of something like coordinates. But lately, when I attempt to place such information in chat, it causes the game to freeze for a second for no reason even though I am in singleplayer.
Steps to reproduce:
1. Log into a singleplayer world that isn't open to LAN, etc.
2. Type something in chat and hit enter when you are done.
--> 
Notice the big lag spike.
Additional Information
Note: It doesn't always happen, and it doesn't happen twice in a row.
Another note: Significantly less lag in 21w18a, but still there.
It seems like the game is trying to access the log and that is why it causes so much lag. It also occurs with command feedback. and feedback from debug profiling, but only the message including where the profile saved.
I have linux too, I'm running linux mint with MATE and I don't have this issue.
This is probably related to the Garbage Collector.
Try these options:
-server -XX:+AggressiveOpts -XX:+UseConcMarkSweepGC -XX:MaxGCPauseMillis=10 -XX:ConcGCThreads=16 -XX:-CMSClassUnloadingEnabled -XX:+AggressiveOpts -XX:ThreadStackSize=2048k -XX:ObjectAlignmentInBytes=64
Also your Java version might help.
Please check if that's still an issue for you in the latest 1.13 pre-release.
Still an issue, even after changing desktop environment.
The issue appears during performance (FPS) drops, and gets worse the lower and less stable the FPS is. It also occurs for every linux user I know.
MetoolDaddy Since you are the reporter of this issue, you can update the affected versions yourself
Can confirm I have major input lag with issue going worse with lower fps
My java version:
openjdk 10.0.1 2018-04-17
OpenJDK Runtime Environment (build 10.0.1+10-Ubuntu-3ubuntu1)
OpenJDK 64-Bit Server VM (build 10.0.1+10-Ubuntu-3ubuntu1, mixed mode)
Can confirm in 1.19.3 and 23w03a