Hello, please consider using better performance plugins to extract TPS data from such as Spark (
https://www.spigotmc.org/resources/spark.57242/) or even calculating your own rolling TPS average with a simple timer.
The concept is really, truly, a good idea but there are many reasons to not use Essentials (just look at some of their commits and fear-mongering recently), whereas spark is basically a must-have for anyone who knows what they are doing :)