It's expected for mods to have different effects on tps of course, but in particular the Cave Enderman is contributing, on average, 16-18% tps usage with only 1 player online and nowhere near any caves.
I put myself in a space station to verify and ran spark profile again at a 2 minute interval and received the same results.

For some perspective, this is almost double than what mekanism is contributing with multiple bases chunk loaded.

Ideally I would like to disable this mod and investigate how this impacts performance, or if there is a config for this somewhere so I can tinker around with that. I checked in config and serverconfig but no luck there.

Cave Endermen should now be turned off in atm9.

In my experience, the easiest fix was to disable mob griefing entirely on the server.

There is a config that can be edited. I am not at my laptop and can't remember where but it's definitely configurable. I think it was in the saves folder for the particular world. I was forced to disable Mushroom Endermen but may look into others as they are lag machines.

@dragongod100 unfortunately since it's not just me playing on the server that isn't a viable option.
Thank @GothBoyUK I'll dig around there and see if I can find it