Minecraft World lags no matter how good is your internet.

Would MC-219639, happen to describe your issue?

FPS does not decrease, but everything in the world is lagging.

We do not have enough information to find the cause of this issue.

Please record a video of this happening and attach it to this report.
If you are on Windows, you can use Windows+Alt+R to open a built-in app for recording game footage.
If you are on Mac (Mojave or later), you can use Shift+Command+5 to open a built-in app for recording your screen.
In case you don't have a program to record videos, we recommend using the free recording software OBS.
In case the resulting video file is too large to be uploaded to the bug tracker directly, please upload it elsewhere (e.g. as unlisted video on YouTube) and link to it here.

_{This issue is being temporarily closed as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.}

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This seems to be hard to record, this happens in weird cases or something I don't know. But I will try.

This occurs very randomly, and I don't know how to recreate this.

Perhaps does making the game windowed with f11 make the lag stop? Or does this occur across chunk borders?

The ping (ms ticks) is not supposed to be in singleplayer, otherwise this craziness happens.

Maybe this happens due to a problem that occurs with integrated servers?