Honestly, turrets in this mods are simply really amazing and useful and I spammed a whole bunch at first.
But .. they are so laggy and inefficient!
Used like 30 timeframes per tick for me!
And a lot of entities placed by them are buggy and simply don't work like they should compared to hand or bot placement

Do you have any examples of buggy entities?

Capsules from bp trees and wagons spawn with no guns from armored train
And, well, lots of upd drain

Is it just modded entities it bugs out with or regular ones as well?

Also, I've heard of the ups drain, but I haven't experienced it, does it happen passively for you or only when the turrets activate?

Maybe it's just modded ones that require special placement to work
I'm not sure if ups drain is passive or not, but it's huge enough to make it unplayable to me
(My pc is quite a potato tho)