Have you guys looked in the Essentials config file?
It's located at servername/plugins/Essentials/config.yml. Open it with a text editor.
You'll see two lines of code ( around line 42 ):
# The delay, in seconds, required between /home, /tp, etc.
teleport-cooldown: 0
# The delay, in seconds, before a user actually teleports. If the user moves or gets attacked in this timeframe, the teleport never occurs.
teleport-delay: 0
By default both are 0. Change them as you wish, save the file, and then do /ess reload in-game.