Information

Full output of /ess version:

Server version: 1.15.1-R0.1-SNAPSHOT git-Paper-57 (MC: 1.15.1)
EssentialsX version: 2.17.1.52
LuckPerms version: 5.0.39
Vault version: 1.7.2-b107
EssentialsXChat version: 2.17.1.52
EssentialsXSpawn version: 2.17.1.52
You are running an unsupported server version!

EssentialsX config: https://gist.github.com/TheMattVid/00e355adbfa338152e48884f664911d5

Details

Description
When players runs an Essentials command (I think only the teleportation ones), the server freezes for about 8 seconds. The tick takes about that long to process.

Steps to reproduce
Run an EssentialsX teleportation command. (I'm not sure, but the problem might only happen after the server has been running for at least a few hours.)

Expected behavior
No lag upon running an Essentials command.

Additional Info
This problem does not occur on my server when I run EssentialsX version 2.17.1.27
Here is a profiler taken of a sample of ticks when this problem occurs:
https://sparkprofiler.github.io/#65yDiZYO8r

Duplicate of #2861. We're working on improving this, but if your server takes 8 seconds to load in one area, you may need to consider upgrading your server hardware.

I'd agree, but the 8 second spike issue happened with one version of EssentialsX and not another.

Chunk loading in 1.14+ is considerably slower and less consistent than before. As your profile report shows, most of that time is spent waiting for the chunk loading thread to finish loading that chunk, which can take anywhere from a couple milliseconds to over 10 seconds. Both 2.17.1.27 and the latest build currently block and wait for the chunk to load before teleporting as this was the default prior to 1.13, so any difference between the versions is likely coincidental.